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I recently serviced a Lowery grand. One problem I had--I plan to go back and fix--is that the sustain pedal had too much lost action in it. I looked under and saw the bar going from the pedal to the damper lever had a nut with threading coming down. I tried to turn the nut and the whole bar moved. My thought is to take a pair of pliers to hold the bar still while trying to turn the nut, but I'm concerned about scratching the bar up. Another idea might be to put some felt under the bar on the pedal to lift it up a little.
I need some ideas on how I can get this done. This lady moved here from out of state and said that her son, who is good with his hands, but doesn't know anything about pianos, put it back together when she got it to her new house. The sustain pedal works, you just have to push it down at least half way or more to get anything to happen with the dampers. The other pedals seem to work just fine.

Does it have one nut or two? The second would be a locking nut. Turn those apart to loosen it so they move.

Also check to see if one of the other pedals is tight. Perhaps rods got switched.

Otherwise, find a spot where some scratching would not be noticeable, wrap some tape around it and hold it as gently as you can.

If al else fails you can wedge a piece of hard felt or thick leather about 1/4 inch in thickness at a time to take up that lost motion.
You might check to see if the lire was installed corectly first.Some times the felt that is up there falls out when installing.

Got leather back-check material in your tool-kit. After loosening the lock nut and finding the nut still too tight, put some of that leather to use in your pliers. ;-)