RMweb Gold highpeakman Posted February 23, 2021 RMweb Gold Share Posted February 23, 2021 I am modifying a model using a resin body on an RTR chassis. However, because I have had to remove the body a couple of times, I find that the resin material has not provided a resilient purchase for the screw. I've tried sticking a piece of plastic over the screw hole. That gripped the screw well but used superglue to stick it down and that has come away from the resin. I could redo that but I wonder if it would be better to fill the original screw hole in the resin and use a self tapping screw. Could anyone please suggest the most suitable filler to use? Thank you. Link to post Share on other sites More sharing options...
JeffP Posted February 23, 2021 Share Posted February 23, 2021 (edited) If you use Milliput it can be drilled and tapped, carefully, and your screw replaced by a machine screw. Self tapping screws rely on distorting whatever you are tapping into, do the forces will just destroy any resin filler Edited February 23, 2021 by JeffP 1 1 Link to post Share on other sites More sharing options...
HR_Line Posted February 23, 2021 Share Posted February 23, 2021 Epoxy would work but you'd probably need to drill a pilot hole into it otherwise it could split. If the item is big enough you could retap the resin, insert a helicoil and screw into that. 1 1 Link to post Share on other sites More sharing options...
RMweb Gold highpeakman Posted February 23, 2021 Author RMweb Gold Share Posted February 23, 2021 5 minutes ago, JeffP said: If you use Milliput it can be drilled and tapped, carefully, and your screw replaced by a machine screw. Self tapping screws rely on distorting whatever you are tapping into, do the forces will just destroy any resin filler Thanks. I accept your point about self tappers. Will have to search the screw box and get some taps - always something missing from the toolbox! Link to post Share on other sites More sharing options...
RMweb Gold highpeakman Posted February 23, 2021 Author RMweb Gold Share Posted February 23, 2021 8 minutes ago, HR_Line said: Epoxy would work but you'd probably need to drill a pilot hole into it otherwise it could split. If the item is big enough you could retap the resin, insert a helicoil and screw into that. Thanks. Something to think about. Link to post Share on other sites More sharing options...
Hibelroad Posted February 23, 2021 Share Posted February 23, 2021 Could you fill the hole with epoxy and push the self tapper in before it sets ? That way the glue would set around the screw and hold it in place. Link to post Share on other sites More sharing options...
RMweb Gold highpeakman Posted February 23, 2021 Author RMweb Gold Share Posted February 23, 2021 4 minutes ago, Hibelroad said: Could you fill the hole with epoxy and push the self tapper in before it sets ? That way the glue would set around the screw and hold it in place. Thanks but I think I would be worried about taking the screw out again and doing more damage though. The loco is DCC and I have had a bit of bother with the chip and had to remove the body a couple of times already. Link to post Share on other sites More sharing options...
RMweb Gold russ p Posted February 23, 2021 RMweb Gold Share Posted February 23, 2021 Plastic steel which comes as a sausage like thing , you chop a piece of and roll it to active it . Its very strong 1 Link to post Share on other sites More sharing options...
RMweb Gold ikcdab Posted February 23, 2021 RMweb Gold Share Posted February 23, 2021 I think I'd try and expoxy a suitable nut on the inside. Then just use a machine screw into that. Trick is to keep the epoxy out of the threads, but any that does leak in can be cleaned out with a tap. The screwing kind, not the water kind! 1 1 Link to post Share on other sites More sharing options...
RMweb Gold highpeakman Posted February 23, 2021 Author RMweb Gold Share Posted February 23, 2021 1 hour ago, russ p said: Plastic steel which comes as a sausage like thing , you chop a piece of and roll it to active it . Its very strong Thanks for info. Could I tap into it? Link to post Share on other sites More sharing options...
RMweb Gold highpeakman Posted February 23, 2021 Author RMweb Gold Share Posted February 23, 2021 1 hour ago, ikcdab said: I think I'd try and expoxy a suitable nut on the inside. Then just use a machine screw into that. Trick is to keep the epoxy out of the threads, but any that does leak in can be cleaned out with a tap. The screwing kind, not the water kind! Thanks. That sounds feasible. Need to buy some suitable screws and nuts but that should be OK. Link to post Share on other sites More sharing options...
RMweb Gold russ p Posted February 23, 2021 RMweb Gold Share Posted February 23, 2021 1 hour ago, highpeakman said: Thanks for info. Could I tap into it? Absolutely its quite a fine texture. Most car shops sell it and possibly boyes 1 Link to post Share on other sites More sharing options...
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