Quote Originally Posted by Stumpkiller View Post
Before I went to filing I would do a thorough cleaning of the contact points on the beam scale. They are usually very fool proof (it's all I use and have for decades).

It's possible something is loose in the 1/10th adjuster. Some have a weight that runs up and down a threaded rod. Make sure that rod is secured.

Clean the "V" and arms on the beam that set in it.

Make sure it is absolutely level and on a solid surface. It didn't loose a foot or pad underneath?
I second this about leveling. Most just turn the adjusting wheel to zero it out and never consider the side to side leveling. If the beam doesn't have equal pressure on both sides it will not real true. Get a small bubble level and check the scale for level front to back and side to side. Clean the seats with rubbing alcohol and blow dry. Avoid any lube at all as it will make things sticky and attract dirt and dust.