Nigel R Posted December 29, 2021 Share Posted December 29, 2021 Can't see vibration causing issues myself, as Paul says it's like screwing into a giant nyloc. If you want to use through bolts, go ahead, both methods work. Something else. I use a dremel cutwheel to cut into a screw, then use this to kind of cut a thread into the mount after drilling pilot holes. Quote Link to comment Share on other sites More sharing options...
Andy Stephenson Posted December 29, 2021 Share Posted December 29, 2021 1 hour ago, Nigel R said: Something else. I use a dremel cutwheel to cut into a screw, then use this to kind of cut a thread into the mount after drilling pilot holes. I've used this method to clean out bulkhead threads in locations where a tap and tap wrench would not access but by using a caphead screw cut this way to effect a crude tap and a ball head Allen key it's an an easy fix. Quote Link to comment Share on other sites More sharing options...
Mike T Posted December 29, 2021 Share Posted December 29, 2021 7 hours ago, Paul De Tourtoulon said: Screwed into plastic is like a nystop nut but with 10 times more surface... Absolutely spot on. I wouldn't self-tap into metal or wood mounts, but into GRP designed for the purpose - why not? The only problem is getting the pilot hole just right. The temptation is to drill undersize for a really tight fit, but that risks shearing the screw head. If you get the hole right and use proper Parker Kalon (or equivalent) screws, then there'll be no problem. Quote Link to comment Share on other sites More sharing options...
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