Channel balance

Question

I have 25 year old Marvin double hung windows. I need new channel balances for 3 windows. On the current balances the stamp is 20 P and 20 F on the 2 smaller windows and 20 with a bsl on the larger window. Can you help me find replcements? Thanks!

Tom · Accepted Answer

I'm afraid those stamps aren't part numbers. I'm not sure what to recommend. Can you show me a picture of the balance? I'd like to see a picture of both ends, as well as a picture of the stamp itself. Thanks!