BubbaDoc

There are numerous spinners on the market, but the easiest and cheapest is to have it FAA welded and heat treated. Most of these cracks form from the spinner moving over the inner bulkhead mount. I had the same problem, talked to all the experts only to find out that tightening the inner bulkhead fixes the problem. If the crack is not fixed quickly you will have a bulkhead blowout. After being looked after by A&P's, the blowout took out the left quarter of the upper and lower cowling. If you need the gentleman in Wisconsin contact let me know. I have 250 hrs in 1 year on the fix.