um theres a little old man by me that that makes hand made cylinder base gaskets up to 1mm thick out of flexhoid also in his in park are 6 different bantam units for deep refurb he is very old school he treats me like his favourite son he never had and trusts me implicity hes an engine man through and through and he says evry engine sounds different even if they are the same whilst running he sells one now and then at different levels of completion essentially at cost and says hes finishing when they are all done you been informed dont forget not to go to high a compression on later bantam engines as it drastically reduces engine life proprtionatly look for the sweet spot and then minus a tiny bit,,,