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Old 29th Jun 2010, 8:23 am   #23
Join Date: Jun 2009
Location: Royston
Posts: 114
Default Re: Copying a control knob by moulding

I have just made my first mould of a knob using RTV silicone. So far it all looks very good.
I'm just working through the suggestions for colouring the resin to get the correct colour matching.
My question is to do with the grub screw. In the first message of this thread, it mentions that you can tap the resin directly with a thread for the grub screw. Is it not necessary to use a brass collar as found in most knobs. Is the resin strong enough without this brass collar. How does it wear with time after several removal/replacement cycles.

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