Shimming the nose gear mount:

I used the stock nose ger on my first Lancair and found the same problem. Instead of shimming, I notched a cut-out in the firewall to allow the spring to rotate freely. In retrospeck, that might have weakened the firewall but not to any great extent. I have not had any problems with this installation. However, the nosewheel is probably the weakest part of this ARF. This gear will easily bend from side to side and backwards (I fly off grass). This may be good for flexibility but it looks bad. Although I am still using the stock equipment on the first Lancair, I installed a Robart nose wheel on my "Partiot" version. Can't comment on how it wroks yet....