I'm looking for the details of the original mainspring fitted to the model 50. The one fitted needs replacing and I'm unsure if it has been replaced previously. Looking on the net doesn't seem to yield any results for an OEM spring. That said I need to measure up to see if one of the new TbT offering will go in. I'm also in a dilemma about replacing the worn leather piston seal for a Vortek leather seal conversion kit, has anyone tried one?

Matt