stamp 15 bsi stamped

Question

I have 4 different lengths and 4 different stamped balance rods. I am sending this set of pictures of a single rod with the purpose of identifying the top and bottom correctly.

The rod in the picture is a 16 inch, non-tilt.

Here is what I need for an order:
16" stamp 15B b.s.i. quantity of 4
13" stamp 12B b.s.i. quantity of 6
25" stamp 24B b.s.i. quantity of 4
22" stamp 21A b.s.i. quantity of 4

all of the above are non-tilt 1/2" channel balancers. I need help assuring the correct top and bottoms are identified.
All of the above are the same top and bottom.

Thank you,
charlie

User submitted a photo of a window balance.

Tom · Accepted Answer

Hey, thanks for posting. If all the balances have the same attachments, this should be simple! I've narrowed your balances down to two possible channel Series: either our Series 351 or our Series 390 balances.

Now, as you can see, there is only one difference between these two Series, and that is their bottom shoe. The Series 351 uses the 15-002 while the Series 390 uses the 15-001. I can't quite tell what you have based on your pictures, though. Please carefully compare their dimensions to your own hardware and see which is a better match.

Comparison of 15-001 & 15-002