Peter,
Most of the insulators do crack, the solution is quite simple. Normally, I don't like super glue, but here is a good application, remove one of the axles; put a drop of CA on the stub insert and replace in the cracked insulator, repeat on all of the rest of the pilot axles. Give them some time to dry, test each axle, if one is still loose repeat (and repeat) until it is no longer loose.
Not an engineering solution, but it works. The insulators can be replaced by a white plastic tube from Plastruct, but again the super glue will have to be used.
Barry
Most of the insulators do crack, the solution is quite simple. Normally, I don't like super glue, but here is a good application, remove one of the axles; put a drop of CA on the stub insert and replace in the cracked insulator, repeat on all of the rest of the pilot axles. Give them some time to dry, test each axle, if one is still loose repeat (and repeat) until it is no longer loose.
Not an engineering solution, but it works. The insulators can be replaced by a white plastic tube from Plastruct, but again the super glue will have to be used.
Barry