Ladder to the roof bed is in two sections that until now have slid together and come apart with no problem at all. After leaving it assembled for a while recently it refused to come apart. Tried heat and cold, tug of war with family members and finally attached it to a rail in the garage at home and hit it many times with a mallet and it finally came apart. Tried silicone spray but it has made no difference. No sign of physical damage to the socket or the inserts. Any ideas gratefully received. Thanks