What to do with a woodworker's made bed that has a slot in it

1, filler: you can use filler to fill the jam groove, such as foam, cotton or sponge, etc., which can reduce the bed shaking, but also can increase the comfort of the bed.

2, adjust the mattress: the mattress is too big or too small will cause the bed to appear jammed grooves, you can adjust the size or position of the mattress to reduce the bed shaking.