unknown stamp option

A landlord from Chilliwack BC says:
May 25, 2014
Hi there,

Looking to replace channel balances on my rental apartment, have one of the channel balances off and the only stamp on there says 20C U.S.B.

I've figured out the 19-002 top, 15-004 bottom and the length is 21 inches...just need to know the stamp.

Also, do I need to bother changing the top sash guide?

Thanks,

Ray
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Tom from SWISCO responded:
May 27, 2014
Thanks for posting, Ray. With a stamp like 20C, you may want to go with our 2030 option. However, it wouldn't be a bad idea to weigh your sash just in case.

You don't necessarily have to change your top sash guides. Do they look worn out? Give them a little once-over and see what you think.
21" Series 350 Channel Balance
21" Series 350 Channel Balance
S350-21
$9.59
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