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S390-29 29" Series 390 Channel Balance

We have a block and tackle that has a stamp 3030 HD B.S.I. It looks like your S390 but the stop shoe looks different. The top shoe on the bar that we have does not have wings. The top shoe on your S390 is the 19-005 but has wings. Ours does not have wings. Can you help us identift what we need. The ... (cont.)

I need to replace the channel balances on a pair of windows but need help identifying the replacement part. Balance has 28 3 DN CALDWELL printed on the back and the channel is 29 inches long. Can you help?

I need replacement channel balances (1/2"). The I.D numbers are 2620 and 2820, but I can not tell which top and shoe to use. My windows are Metalite, installed around 1981. Thank you.