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if you put this 2mm shim @ the rear or front of the rear main cap the crank will move accordingly,
this may upset the front/aft location of the timing gear & distributor drive gear.
I therefore compared the timing gear location with a std CIH crank situation:
if you put the 2mm shim @ rear of the main cap, the timing gear will move 0.5mm rearward,
if you put the 2mm shim @ front of the main cap, the timing gear will move 1.5mm forward,
so it's better to put the shim @ rear of the main cap.
when the crank was offset grinded the oiling hole moved a tad forward on the rod journal,
the Mantzel rods use wide BMW bearings that nicely cover the oiling hole,
but putting the 2mm shim @ rear of the main cap will pull the crank rearward,
this will also help keeping the rod centered on the oiling hole.
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