How to solve the crunch of sofa beds?
1, find out the ring position (or cause);2. Tighten the relevant screws;3, add a little talcum powder in the pine frame, do not use grease;4, in the pine box pad some thin rubber or wood, do not use iron nails;5, don't refer to a bed or sofa placed close to the wall, to prevent friction with the wall bed or sofa.
Do less, try to learn the style of the four field forces....Field operations。。。。The spring is aging, and if there is a cushion on it, it will be reversed. If there is no mattress, there is a cloth under the sofa... Put some sponge in
