We just picked up several Otis 21UCL units. But the doors all slam shut. All five of the operators are 6970s.

My question is this! What have you done with these old door operators?
Rebuild, replace or modifaction?

I've rebuilt several 20+ years ago!
I've maintained units that were replaced with operators such as GAL!
And as of recent we maintain a unit that has been modified with a MCE Smart Traq.

Please share your opinions, experiences and thoughts on this...