Installed in 1996. There is a lot of play with window moving by itself with operator attached.
Casey from SWISCO responded:
September 26, 2018
Hello,
You have a few options here. If your operator arm is 9-1/2", either our 39-028 or new 39-028E will work for you. If you have a 13-1/2" arm, you'll need our 39-014 operator. Thank you!