Need help on a problem with a 20's vintage winding drum. A previous company came to the job and re-roped the car and counterweight. It appears to be correct. This is a overhead drum, single counterweight,straight over...except for the drum. My problem is that the car will only pick 800 lbs. on a 2000lbs capacity car. The motor was gone through and they say is ok. So I thought it was the machine binding in the up run. By the way the down run works great. So I picked the brake to see if the car would drift up....the car actually went down. I am baffled!! Is a winding drum not balanced at 40-50% like others? By the way nothing that I can see added to the car and the counterweights do not seem to have been disturbed. This company wants to use this car as a freight if I can get it to pass the 5 yr test. Any thoughts on the issue?