Attach the stock to the dovetail. Put a nut in the recess in the stock. Put the spring and release button in place. Put the bolt through the hole by the hinge, capture the release button with it, and thread it into the nut in the stock.
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Shitty stock image may be changed at moderator discretion.
Ive also tried an m4x35mm, like the text on the hinge latch itself says.. and still too long for the button hole to secure. Also doesn't seem like it's a "one-time" thread in the plastic type hole either.. its as wide as the m4 with zero grab.

pretty sure that's just an m4x50 running all the way through.
MCXish? That's a Sauerkraut hinge. Are you looking at the right README? Is this like an adapter that puts an MCXish arm on a Sauerkraut mount?
Yea there is a brace called the mcxish that uses the carbon tubes and then a printed price the 2 CF tubes fit into.
I remember running across this same issue. Ill go look at mine and see what i came up with.
that'd be great!