Originally Posted by gibbo500
Bought a Zodiac diaphragm and tried it out today, still letting in water. Looking at the Zodiac diaphragm the centre pin is narrower and therefore a looser fit than the original. Anyway had a great day out winter sibbing so really not too fussed.
You can wrap teflon white tape on central pin to fill excesive play and auto center better diaphragm position agains plug base. Cut to desire height. Put a ball of paper tight against diaphragm, get yourself Abro gasket maker or a good silicone, remove lid, put tube nozzle in middle of central diaph pin, squeeze untill the inner central pin is completely coverd by gasket maker, this should make the diaphragm to have a tighter fit against interior diaphragm base and seal better.
If possible remove complete plug from sib, make this process outside so to center better the diaphragm before sealing other side. Let dry al least 24 hours defore sibbing again. Good luck !!Something positive should result. A pitty that Zodiac diaphragms arte pin thinner than current plug in use.