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Great design!

I'm still in the process of printing everything out, but assembled one side and it's bringing up a question - is the connection between the Back Pin and the spring loop intended to be friction fit? It seems like the spring loop might easily slip off the pin because the pin is just barely long enough to catch the spring, I don't think I really want to glue it in case I need to replace the spring, and don't see any extra pieces similar to the Caps that are intended to keep it in place.

Edit: It will be a problem, just trying out that "wall assembly" the spring keeps slipping off the pin.