A couple of things for completeness. Vic is probably correct that the loaded PTFE would be better then plain PTFE. Both IGUS in Europe and Pacific Bearings, in the States but with agents over here, are firms I have dealt with. The problem is that if one is trying to keep the original parts then some form of adhesion is probably required. The PTFE specially made for that is the only one I know of but there may be others. The other thing to note is that if one wants to keep almost the original appearance but still have a fully sprung seat then it is possible. The trick is to keep the original friction dampers but then support the base of them by two struts coming from two holes, one above the other, at the rear of the footrest plates. The magic can work because one is making a triangle, albeit a narrow angled one, by using two struts which start off about two inches apart where they fasten to the rear of the footrest plate. They can be through bolted to the central part of the friction damper. If the two supports are painted black then they hardly notice. All I can say is that by 1954 Vincents had fully sprung the seat and started to use a coil over damper. This was reportedly due to consultation with VOC members.
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