Avon Lifting Point Help

[Smesh]

So I'm trying to make use of the lifting points in my avon. I wasn't sure what the little spots were with the plastic bolts in them but I suspected they were the lifting points and finally got two of them out today. And by God they are definitely for eye bolts. They are super beefy and go through the plywood into what looks like a thick steel threaded backer. But do you think I can find ANYTHING on the net about the specs of these lifting points? No.

So I'm going to use the two bolt plugs I got out to try and figure out the thread, and then I'm going to have to try to figure out how to get the other two out, since they just cracked apart when I tried to use a slotted screwdriver to get them out.

Anyone know how to get broken plastic bolts out of the machined holes?

Does anyone even use these lifting points?

[ShinyShoe]

Would have thought some release agent and a drill 3 sizes smaller than hole, ideally with a reverse bit and on reverse. Either it comes out as you drill but if its that brittle it will crumble out the thread once there is space.

There is an ap that let's you photo a thread and then line up with templates on the camera to find the thread.

[jeffstevens763@g]

smesh
buy a bolt extractor you drill down the middle of the bolt then turn in the extractor it tightens anti - clockwise various sizes they look like a tap but have a pig tail kind of thread to grip let me know if you don't know what they look like i will dig one out and send a pic.

cheers

[Pikey Dave]

Get a flat blade screwdriver slightly smaller than the diameter of the thread & twat knock it straight down the centre of the plastic, unscrew. Some times brute force & ignorance is the only way, fortunately I'm loaded with both😎


.....sh1t happens.......

[mick]

Originally Posted by Pikey Dave

Get a flat blade screwdriver slightly smaller than the diameter of the thread & twat knock it straight down the centre of the plastic, unscrew. Some times brute force & ignorance is the only way, fortunately I'm loaded with both😎


.....sh1t happens.......

Noooo don't use a screw driver a bolt smaller than the thread is better acts like a punch 👍 oh and don't forget a big hammer 😜

[Pikey Dave]

Originally Posted by mick

Noooo don't use a screw driver a bolt smaller than the thread is better acts like a punch 👍 oh and don't forget a big hammer 😜

I'm assuming it's a blind hole & got to come out upwards. So it'll need unscrewing. This is going to turn into a hole drilling thread if we're not careful


.....sh1t happens.......

[Smesh]

Okay guys thanks. I'll figure it out. Can't punch it through because the hole has a bottom. First thing I'm going to do is head to westmarine with one of the plugs and see if I can find an eyebolt with a big enough eye and a bolt diameter and thread that matches the plug. Then I'll cut the bolt off to the right length. If I can't find anything. I'll use pad eyes instead but it would be nice to use the reinforced threaded holes that Avon supplied. The strange part is that even with the plastic plugs screwed in, the hole is slightly larger around the bolt until it threaded into the stainless backer, so the plywood is exposed and visible and subject to water infiltration and possible rot. The deck hull doesn't feel soft by the lift points but it seems kind of dumb to supply them but not have them properly covered and protected from saltwater getting to the core.

[mick]

Rite then back to Daves way but see if you can warm the plates a bit might make it easier to get them out theses are handy but you need a friendly farrier

[Pikey Dave]

Originally Posted by mick

Attachment 109391 theses are handy but you need a friendly farrier

Not met one yet


.....sh1t happens.......

[mick]

No you won't there all terwots 😇

[Smesh]

Originally Posted by mick

Rite then back to Daves way but see if you can warm the plates a bit might make it easier to get them out Attachment 109391 theses are handy but you need a friendly farrier

Can't really warm anything. Plastic bolt screwed into wood for the first 3/4" flush to the gelcoat. Don't want to burn the pretty orange gelcoat.

[mick]

Originally Posted by Smesh

Can't really warm anything. Plastic bolt screwed into wood for the first 3/4" flush to the gelcoat. Don't want to burn the pretty orange gelcoat.

I was thinking hot water or hair dryer

[jeffstevens763@g]

Drill out then send a tap down to clean the threads as an option

[ncp]

Screw Extractor Set 12 Pc

[Pikey Dave]

Originally Posted by ncp

Screw Extractor Set 12 Pc

I don't think screw extractors or the more exotic methods will work, we're talking plastic & the extractors will just slip. As it's plastic, just destroy it with anything to hand & chop it out.

[jeffstevens763@g]

Having done something similar and to protect the thread we drilled the nylon in this case out as near as possible then used three stage taps to clean out easy if you know the thread size. I suppose you could melt out with a thin soldering iron or rope cutter then tap out.the screw extractor is worth a try as if it fails you have lost nothing.hammering a screwdriver in making it even more tight not the way I would go OMO

[whisper]

Just measure the plugs you have removed and the mark the length on your drill bit with tape so you don't drill down too far, start with a small drill bit in the centre and then increase the size 1mm at a time. once you get close the final thread should come out like a spiral.

Off the top of my head it will be a M8 lifting eye like this?

https://www.s3i.co.uk/EyeBolt.php?pi...Fb8aAns58P8HAQ

If you get stuck I'll tell you the size next week

[Smesh]

I took one of the plugs to westmarine and found a sea dog eye bolt in 10mm and the nut seemed to fit in the plastic bolt from the Avon. Only thing is the threads of the plug are a bit bunked up from corrosion so it was a bit of a tight fit. Not enough that I couldn't screw it on by hand, but enough that I wondered if the plastic thread could be conforming to the bolt. Reason I wonder is that I can't see the Avon being metric seeing as it's made in England.

The sea dog bolts at west marine are rated at 9000# and are $30 each! Ack! That's $120 to add four eye lots and I would have to cut all four of them down. I would much rather get eye bolts like you have in your photo. The price is hard to beat too!

These are the ones I can find locally:

Sea-Dog : Quality Marine, Industrial and Rigging Hardware

[John Kennett]

Originally Posted by Smesh

Reason I wonder is that I can't see the Avon being metric seeing as it's made in England.

It will be metric. We've been using ISO metric threads in the UK since the 1960s.

[Smesh]

Originally Posted by John Kennett

It will be metric. We've been using ISO metric threads in the UK since the 1960s.

Okay cool. Now I'm having trouble finding a supplier that will ship to the US or one in the US with a bolt length at least 17mm, as it needs to be long enough to reach the bolts inside the hull. The plastic bolt blanks are 7/8".

I'm also confused about the breaking points. It seems like the 316 eye bolts have less than half the strength of galvanized m10 eye bolts (500# vs 1160#). At a 45 degree angle 500# will only give me a breaking strength of around 100# and that won't cut it.