Well i hope the thin gasket solves the rubbing problem.Can anyone tell me the reason for going to an aluminium backing plate?

I have two 82's and they both have a few years and lots of hours on them as they are my favourite engine for 46 size decathlons.During numerous tear downs to replace bent crankshafts,bearings and collateral damage like bent intake tubes,i've had no problems with the plastic backplates.You can see light witness marks on the inside of the backplate from the crankpin and perhaps the plastic is better in this regard..