furniture
I have a sofabed whose back is fixed to the bed by bolt and nut. When I try to loosen the nut by wrench, the bolt and nut move together. There are no rust. How shall I loosen the nut?
Update: the head of bolt has a shallow hex hole. I have got help from another who used hex wrench to stick into the hole of the bolt head and fix/rotate the bolt, together with a regular wrench to rotate the nut.
If the threads are in metal, then you can replace the threads. What you're looking for is called a T-nut and should be available at any hardware store. Take a bolt with you to get the right size.
If the threads are in the wood, a simple option is to just take the bolt to a hardware store and buy a bigger bolt. T-nuts are also a good option if a bigger bolt isn't practical, but you will also need new bolts because you will not find T-nuts that match the threading of your current bolts.
You could remove the brace, drill holes into the other bars that are thiner and move the brace up closer to the glass. Obviously the closer you get to the top the less steady it will become so only allow enough room to where you are comfortable. I actually use to have the same desk in black. The glass makes it heavy so as long as one side is braced correctly it shouldn't move to much.
Best Answer
Best way: put a wrench on the nut and the proper driver or socket into or over the head of the bolt, and turn one while keeping the other stationary.
Second best way: put a wrench on the nut, and a pair of locking pliers on the shank of the bolt. You WILL damage the threads of the bolt; just try not to cause so much damage the nut won't come off. This is the only way besides cutting to remove a carriage bolt, which has a flat or a smooth dome head that can't be "locked on" with a socket or driver, or to otherwise remove a nut from a bolt when you can't get to the head.