PanAm window balances

Question

I have windows with these spring balances. 5 windows have 1820 and 4 windows have 2340 stamped on the balance. Also, I want to replace the plastic part on the window sash that holds the balance down.
Thanks

User submitted photos of a window balance.

Tom · Accepted Answer

Please see our Series 377 channel balance, this appears to match what you have. For the top sash guide, check out our 18-042.