[Adam Freeman]

Originally Posted by BJC

It looks to me that they are using the same method that 67 uses. If that's the case then that is a tapped 1/4" aluminum plate which supports a dead axle in shear and can be slid to tension its respective wheel.

Bryan is a very good observer. 503 actually met with us over the summer to review our chassis / drivetrain strategy.

It looks like they took some pretty good notes. This chassis looks very similar to the sheet metal chassis we have produced in the past. Though, we typically have sometype of mid panel designed in for additional support.

I believe they water-jet aluminum axle blocks for the wheels. We typically use 0.25" rectangular blocks with capture nuts to secure the blocks to the frame. 1/2" axles are typically bolted to the blocks with a flat head 1/4-20 bolt.