[chrisguyw]

Yes, the jig has identified front axle front/rear play. Is this solved by slipping ferrels over the axle to take up the slack?

You can do better than common ferrules (they are not really precision bits)...........if you can wait until mid March (I am away until then) I will send you some precision bushings made specifically for the front ends of most plastic chassis...these reduce the fore/aft play of the axle (this reduces the tendency of the front wheels to "Steer" the car).

I will send a couple of types.......... the first ones will fit most Slot-it/NSR/Scaleauto front axle uprights, and are made on the long side so that the front end grub screws run on the bushing not the axle.




The second type can be used either as front or rear bushings, and the reduced outer diameter allows them to fit in a variety of applications.....reduced dia, on the left, 3/32 x 3/16 oilite on the right.  (these are great for replacing the rear bushings on Slot-it/Scaleauto pods.


   

These are particularly handy for the front end of several types of chassis........here they are used on the front end of a Policar F1 car.........much better

They are installed with just a hint of play, (not glued) ....the vertical axle location is still controlled/adjusted by the grub screws.