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Old 23 October 2015, 12:28   #11
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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.
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Old 23 October 2015, 12:35   #12
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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
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Old 23 October 2015, 12:40   #13
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Drill out then send a tap down to clean the threads as an option
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Old 23 October 2015, 13:21   #14
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Screw Extractor Set 12 Pc
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Old 23 October 2015, 13:58   #15
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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.
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Old 23 October 2015, 14:54   #16
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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
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Old 23 October 2015, 19:57   #17
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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
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Old 25 October 2015, 01:18   #18
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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
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Old 25 October 2015, 02:03   #19
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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.
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Old 25 October 2015, 04:27   #20
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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.
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