Dave,

I had the same issue with one of the mains on my X-treme F-4. The problem was one of the aluminum hub halves was warped. I have the same wheel on my F-16 and found that out by swapping parts until it held air. Skymaster sent me a replacement half hub after I explained the problem to them and sent them a picture of the part that needed replacement. It took about two weeks to get it from China.

If you don't have another wheel, or can't borrow one that probably doesn't help much. You might want to contact your dealer (I went through BVM) or Skymaster directly and ask for a replacement wheel.

Good luck,
Joe