"I ones saw a addition to the single bearing wheel that held a second bearing 
on the
axle.

Maybe I can find a photograph of that setup, but I am sure it will be hard to 
get an approval for that."

I had one of those on 29H for a while, Hartmut, and do not recommend.  It was 
not machined correctly to fit, took longer bolts, and eventually cracked out.  
Do Not waste money on one; buy avgas and fly more.
       Percy in SE `Bama

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