JD 54C Deck--wheel bushing

[sgoldste01]

That looks like a allan head on the backside to remove a shoulder bolt.

I think the picture gives the illusion of an allan head. But upon closer inspection, the hole is round, and doesn't provide flat edges for an allan wrench.

 

[sgoldste01]

So has anyone had luck drilling out the fixed bolt from the guage wheel arm, and replacing it with a common sized bolt from the hardware store?