I checked the three 8" wheels I have.
two were ~0.56" and one was ~0.44".
My memory is that the two 8's on the rear had press in rubber stems.
5177 had a 7 and 8 on the front when I got it. thus I would assume the one 8 with the 0.44" stem bore was the replacement
I will need the same repair solution you come up with
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