yeah,it could very well be that it was replicated in a lighter material bro ! ,but, i'd imagine that these rubber angle grinder sanding pad bases would have been quite cheap back then ,and accessable in most tool shops back then too ,if the props department had the budget to buy a load of radios for the packs back then,, i'd also imagine that all the other bits needed for the packs wouldnt have been a real problem (budget wise) either ......Ruggero, this is what really impresses me about you bro..... you have an EAGLE EYE for all the little details,and i salute you yet again for bringing this plauseable suggestion to us all !