Protowrapper RB1 - Modular rod building system

The Protowrapper RB1 is a modular rod building system that uses 80/20 aluminum as the base. It was designed to be built using easy-to-source materials that can be purchased at the hardware store. Please provide feedback for improvements.

Current design is for hand-wrapper. A drying-motor and chuck is in development and will be released shortly.

I sourced all the screws/nuts based on what already had and what I could locate at HomeDepot, hence the mix of SAE/Metric.

Bill of materials:

Roller Arms
6x #120 O-rings (1 3/16 OD)
6x #10-32 1 inch round machine screws
6x #10-32 nylon lock nut
4x #10-32 1 1/2 inch round machine screws
4x #10-32 wing nut
4x #10 washer
4x M3 hex nut (can use SAE but could only find metric t-slot nuts)
4x T-slot nuts
2x ~24in 30x30 aluminum extrusions (https://us.misumi-ec.com/vona2/detail/110302686540/?HissuCode=KHFSF6-3030-4000)

Thread Carriage

1x Sewing Tensioner (for thread carriage) (https://www.amazon.com/gp/product/B0B8B31YKJ/r