I have 3 windows that need to have their balances replaced. They all look like a Series 351 Channel Balance (in fact they're spot on)... problem is the length of the metal part is 30 5/8" NOT including the plastic caps. They're stamped "30.4". Can I go down a size to an even 30" channel balance? BTW, each window weighs 20 lbs.
thank you for your help with this.
Don