I have had the same problem, The Shell will squish over time and cause the o ring blowage... Before you spend loot on a new head, try putting thin shims in between the Dome and Shell. I have the smallest feeler gauge i could find cut up just to bring it out that little bit and have not blown a...
I'm going to go with the legdrag combo in my ski, It's a good stepping stone in between just a prop and complete mag pump, if you want to upgrade later you can always sell the TBM /prop and make a good percent of your money back to put toward a mag.
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