Coil balance question

To Whom it May Concern:

I have several vinyl single hung, dual pane windows in my house which developed fog in between panes, so I had the glass replaced. The window company used a heavier glass on the replacement panes, so the existing coil balances no longer work. The original coil balance configuration consisted of your coil balance shoe part # 15-180, bushing # 15-182, coil balance clip # 15-186, and series 190 coil balance # 640-S190. The new windows weigh 21.6 lbs, so I

That's what I was coming up with.......I put the order in on Tuesday. Based on the fact that I'm going with two springs instead of the original one, I'm guessing I have two mounting options....use the original screw location for the bottom spring, in which case the assembly would stick up above the top of the bottom sash, or vice versa, which would limit the opening height of the window by the depth of the additional spring. Is that correct?

Good point. Thanks for the help.....we'll see what happens.