smoother engine bearings
Hi!
I think Nelson uses Swiss, WIB bearings in C3 quality ( C3 is a norm for a bearing with more play than a standard bearing )
MVVS also has these bearings in their Q-500,.45 and .49 engines.
The .40 could be equiped with these too but they are not installed at the factory.
C3 or C4 bearings are often used in pylonracing engines.
Regards!
Jan K