SWISCO - The Replacement Hardware Authority

Compatibility of Pivot Locking Shoe 15-046

A handy person from Somerset. N.J. says:
I have vinyl tilt windows with broken shoes causing the windows to fall dangerously. I removed a spiral balance and shoe to take measurements. The Pivot Locking Shoe 15-046 seems to be the exact measurements needed. However, the spiral balance is 30in. length and 1/2in. diameter. You don't show a 1/2 in. spiral balance (only 3/8 and 5/8) and only 29in. length. Do these size difference with the spiral balance indicate a different manufacturer and if so, will the pivot locking shoe 15-046 be compatible?
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Tom from SWISCO responded:
Unfortunately, we can't really determine what Series spiral balance you have based on just the shoe. Are you sure the diameter is 1/2"? I recommend getting as exact a dimension as you can. Keep in mind that sometimes they'll measure 9/16", but will be considered 5/8" in the trade.
A quick learner from Somerset, N.J. says:

I re-measured the spiral balance and it is 5/8in. I don't now how I misjudged it previously. However the length of the spiral balance is 30 1/4in. and I checked that. I'm presuming that the length is immaterial so I'm going to order new locking shoes for my windows. Thanks much.
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Tom from SWISCO responded:
The length actually is pretty important. Are you making sure to only measure the tube? That's how we determine the length of our spiral balances.
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