I realize that, honestly I hav`nt a clue and can`t remember and could`nt see exactly where that piece of shim was jambed in there, I just seen a piece of metal, grabbed it with a needle nose and yanked it out. When disassembling I did`nt see any other remnants of the shim.
I think my pics may be decieving , I think the pinion is in pretty deep but is showing up as a smear instead of the bare metal marking, if you look real close, at the previous pics with larger backlash. Here is a couple pics as requested,