Hi. I have four old commercial 4'x5' metal framed windows that need new balances. Based on everything that I could gleam from your website, I am guessing that I might be able to retrofit the 29" series 400 version. The current balances do not have a color tip. The steel tubes are 3/8" in diameter. Some of the balances still retain (at least a portion of) a plastic sleeve that increases the diameter a little bit but not much. Length is around 28.5". The bottom mounting brackets are unique in design, but I think retrofitting the #14 brackets would be easy. I am not able to remove the sashes to weigh them, but should be able to do so by placing a portable scale in the window if actual weight is critical. The sashes are 2.5' by 4' but with 1/8" glass, they don't seem very heavy. Your help in identifying viable replacement balances is greatly appreciated!
John
