[pasbesoin]

A floor rep at IKEA shared with me their method for putting desks together when the components don't actually screw together. For example, with a top placed on trestles; the trestle top has holes that align with a pin screwed into the underside of the top, but it's not very secure.

Industrial strength Velcro. It holds the top in place quite well, yet makes it very easy and quick to tear the desk down. With self adhesive backing, you place a strip of the "nap" on one piece and a strip of the "hooks" on the other piece, and Bob's your uncle.