I replaced my Model 300 with a Model 310 back in May, had no real difficulties with the mounting bolts. Yes, it took some wiggle to find the holes in the base. Once you have it properly seated, then a open end or box wrench of the right size is the best tool to use for tightening the bolts. Having replaced several household toilets, I thought this was actually quite a bit easier. Don't know know to suggest, other than patience.
Good luck!
Roger
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TV 2010 Ford F-150 Supercab
TT 2016 Jay Feather 23RLSW
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