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Earlier this year I made an under desk mount for my keyboard. I did this with two drawer slides and a few pieces of pine wood. Overall it works, but I can’t really pull it out all the way, because it sags and has one time fallen into my lap when I had it pulled out.

Any tips for fixing this? Do I need a different type of mount, or is there a way to reinforce this for when the keyboard is pulled all of the way out? Thanks!

https://imgur.com/a/3i9mX4s