I had Dave back to fix a slow-moving sliding glass door. He removed the door and replaced the wheel apparatus. Now the door works perfectly. (It whirs when I use it. Sometimes I open and close it just to hear the sound.)
He also cleaned a stained wall. I thought it would have to be repainted, but he cleaned it with solvent. You cannot tell it was ever stained.
Dave is an excellent handyman. Just follow his instructions on his Web site to contact him. It amazes me that anyone would have trouble with him.