Coil installed in hollow housing

A quick learner from 10520 says:
Not sure which coils to buy. Window doesn't stay up. Can you indicate correct coils and right latch pls (latch broke too). Thanks!
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Tom from SWISCO responded:

Your pivot shoe appears to be a match for our 15-087, which is compatible with our Series 180 coil spring. Look these over and let me know if you agree. You'll need the stamp off the old coil to confirm the best replacement.

A quick learner from 10520 says:
Thanks very much. Yes this seems right. Two questions:

Does the coil also come with the piece and screw to attach to the frame (pic attached)?

Also I don't see a cutout to remove the pivot shoe and coil. The video shows a tool to open up the area but the tools seem to be pretty expensive. Is there any other way to open up the area to remove and install new pivot shoes?

Finally, what's the best way to know the weight I need for coils? You mentioned a stamp on coils but since I can't really remove them without jam spreaders I'm not able to see the stamp.

Thanks for ur help!
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Tom from SWISCO responded:

Hello! That looks like our 16-024 mounting bracket. This is sold separately. You can install it using a screw like our 33-072, or  just reuse the screw you have now.

If your window jamb doesn't have a cut out already, then you can make your own. That is a much less expensive method. I will share a video at the end of this post that shows you exactly how you can do that.

Finally, concerning weight, referring to the stamp on the spring is the best method. If you want to know that before you remove your balances, you will have to weigh your sash on a scale and divide that by how many springs are used to support it.

So, let's say for example that your sash weighs 12 pounds and you use only one spring on each side, for a total of two springs. You would divide 12 by 2, giving you 6. In that scenario, I would recommend the S180-6, which carries 6 pounds per spring.

Here's the video I mentioned:

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