Mysterious kinco replacement part

A home owner from Fernandina Beach, Florida says:
We need to replace several 30" Series 385 channel balances on Kinco Windows. There is no stamp on the balance. The windows are double pane and heavy to lift when you have to prop them open with a board. Once we figure out which channel balance weight we need, we will also be ordering sash guides 18-166. We also need to purchase some ????. They are small 1/2" x 1/2" plastic pieces that pop into holes in the sash and slide along the frame. I have no idea what they are called, but they are easy to lose! Thank you for your help!

A home owner from Fernandina Beach, Florida says:
I tried to upload a .jpg image of the :thing" but it would not upload.
User submitted a photo of window hardware.
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Paul from SWISCO responded:
Hey, Lyndan. It's hard to tell what our Thing is without seeing it removed from the window, but I suspect it's similar to our 67-026 face guide. At the very least, I think it serves the same purpose. Check it out and see if you agree.

As for the balance stamp, you can just weigh the sash and compare it to the list of options we show under the S385-30. That's the best way to know what option you need.
A home owner from Fernandina says:
Hi Paul!

Thanks for your response. The window sash weights 24 pounds as measured on the bathroom scale. We checked the references you gave us for the "thing ????" and think we have figured it out. My husband is going to pull one out so we can be sure. As for the window sash - how do we translate the bathroom scale weight into the correct channel balance stamp weight? Again, thanks for your help!

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Tom from SWISCO responded:
If you look at the Chart under the S385-30, you see that each option is associated with a weight range. Just find which weight range covers your sash weight.
A home owner from Fernandina Beach, Florida says:
Thanks, Tom - so the bathroom weight of the window is the sash weight - no factoring or anything like that. Thanks!

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