Spiral Balance Shoe

A home owner from Houston TX says:
I would like to order the 29" Series 306 Spiral Balance with the 15-066 spiral balance shoe. But I have a 15-073 shoe on the current spiral balance spring.
Is there a particular reason why I can't use the 15-066 spiral balance shoe in place of the 15-073? The 15-066 seems sturdier and seems to be the same general dimensions.

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Paul from SWISCO responded:
The 15-066 and 15-073 both work on the same principle, but the 15-073 seems to have a more open hook to attach to the sash while the 15-066 is a tighter hook that might make that harder. I always recommend to use what the original window manufacturer design for their window, though. The builders very likely had a reason for using what they used. Besides, the 15-066 isn't really any sturdier than the 15-073. They're both held on by a rivet.
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