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Finally got around to converting my old gold pan to 3/16" pin drive. I picked up a pair of Atomic aluminum steering blocks, TA hex front axles for the SC and 4 3/16" i.d. x 5/16" o.d. x 1/8" bearings. I drilled out the opening to 3/16", then used a 5/16" center drill end mill to bore down .125" on each side of the steering block. Made a .090" spacer to take up the room from the front of the block to the drive pin.
For the rear I used the TA Associated RC10 Worlds CVA Set 3/16" Axle kit 6371. I did need to add a spacer between the hub and the drive pin.

Oh man, thanks to google I found this post. The same topic was just on the RC10Talk Facebook page, but using Traxxas parts. Since the 3/16 axels are also becoming scarce, and I am too lazy to fabricate some out og 3/16 bar stock, I migh copy this design, with the small change of going metrc, using 5x8mm bearings, but flanged. I would have done the same with the 5/16 holes ib your design, drill all the way through and use flanged bearings.

nice compact design with mostly AE parts.