You could measure how far in your frame the post is going to go, then make your thingy to go either side and under the post in the right length so there's no chance of slipping. So all one piece, sort of U shape rather than two piece || shape
@PhilDAS started
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You could measure how far in your frame the post is going to go, then make your thingy to go either side and under the post in the right length so there's no chance of slipping.
So all one piece, sort of U shape rather than two piece || shape