Thanks Max.
Unfortunately I bought this Type of bushranger. A couple of cylinder mower specialist shops have advised me that the whole plastic system is crap and even replacing parts will continue the same old problem. Thier fix - get rid of it and buy one of the new Bushrangers aka Supaswift that is the proper old style scott bonnar system. My Bushranger version was made in NZ and Bushranger has now deleted this mower out of its lineup. I will try the shimming method.
Regards
Clacker
