1/2" x 21" balance rod

A quick learner from marion in. says:
September 28, 2015
I have a balance rod that measures .538 with digital calipers and it measures 21" long and it has a red bushing in the end. Will the 3/8 balance work as a replacement? Your item S900-21? Thanks Phil
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Paul from SWISCO responded:
September 29, 2015
No, I don't believe the S900-21 will work. That has a 3/8" balance tube which is much smaller than .538". Consider our S600-21 instead. This tube is 9/16" (considered 5/8" in the trade) which is only slightly larger than .538". Please double check your measurement and let me know if this will work for you.
Spiral Balance Charging Tool for Tilt Windows
Spiral Balance Charging Tool for Tilt Windows
75-006
$9.97
21" Series 600 Spiral Tilt Window Balance
21" Series 600 Spiral Tilt Window Balance
S600-21
$8.58
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