Replacement Balance marked 30 5

A quick learner from Rochester MI says:
For Avon window. Marking 30 5 E0 Caldwell.
A quick learner from Rochester MI says:
Replacement balance for Avon window. Marked A1640.
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Paul from SWISCO responded:

Hello. I see that you were looking at our S351-31 channel balance as a possible option for a replacement. I believe you are on the right track with this recommendation as well. The most important measurement you want to focus on is the depth of your bottom nylon balance shoe. See if it matches up to ours. If not, you may want to see if the S390-31 would make the better option. Look over each one to choose the best match. Whichever one you decide to go with will use a 3050 stamp option. 

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