All the spherical bearings supplied in the kit originally
are standard bearings available through any bearing outfit like Motion
Industries. I would suggest going to higher grade bearings anytime a
replacement is needed. I have done this on the elevators and in various
landing gear bearings once play developed. Higher grade bearings will
bump up the strength immensely. For example, compare the Aurora MM
series rod end bearings to the AM series. You'll get about 2.5 times
the strength simply due to better materials. For spherical bearings
compare the COM series, as originally supplied, to the Aurora AIB series.
Here again, strength is more than double.