Many thanks for all the replies, so I can settle for a Mac 10 (.61). All I need now are some spares for it. It runs well on fiirst kick and developes quite a bit of power for it's age - however due to to the worn big & little end bushes it will not hold full power :-)

Having now got it to peices those are the only worn parts. Pleased it is not an MDS even if it is a pre-cursor to the MDS range :-)

Any one with any brilliant ideas as to where I can get some spares would be appreciated.

TD