Not sure why they would be useless. I forget where this had got. Was there something to copy? If the rubber exists then there should be the possibly to work out the sure hardness. Its 60 for KR200 and 40 for Tiger, if I remember correctly, for instance. Russell took great care to get this correct. Sadly I am not so sure anyone has paid so much attention to detail since they made certain he would not be making further spares for Messerschmitts, and the firm he used has now closed down. So other than the tooling its back to the start on that one, To the extent that some two pack cold poured ones have reappeared, Well we know they do not work, so good luck with that, burks. Fortunately I bought a load while they were available.
If you have nothing to copy then you have got a problem. Which Brutsch used these units? I cannot believe they are a one off. Trouble is with all this rare stuff, is folk get carried away with the marketing, not the engineering. So much gets lost over the years. However this is the problem and responsibility of owning rare things. You have to make great investment of time and/or money to bring it back to its finished state, especially when some prior owner thought he had a brilliant idea to change things. Otherwise you have the brilliant idea to change things, and risk reducing the interest in the machine for expediency of getting it to work. There is no easy answer without information.
