Locking J Spacer

I have slightly modified the design of the J Spacer so that it locks in place after the first tube is installed into the XZ Main assembly. Hopefully this will make it easier to assemble the side plates into the full gantry by not having to chase the J spacers around and have them fall out while the whole thing is flexing about like crazy. This has been made for 25.4mm but should be scaleable to 25mm.

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