EA81 Propeller Bolt pattern / size?

[user 107330]

Hello all, Greetings from Mays Landing, Southern Jersey. I have an EA81 powered Airboat that's got a 2 blade 60" Wood Prop. I drove 7 hours round trip to purchase a 3 blade Composite ground adjustable propeller because the dimensions provided by the seller were the same ... so I thought. The 6 holes align perfectly However, the Bolt holes on the "New" prop are smaller than mine. My Bolts are M10 x 1.0 thread - Is this normal for the EA81 mounting hub? Question 2, Can the "New" prop hub be Drilled bigger so my bolts go through it? Question 3, can I change the mounting hub on my engine to match the "New" prop? I'm a bit lost and seek your Great Knowledge. Thanks in Advance, Bob

 

[user 4289]

 

[rv7charlie]

 

[user 107330]