coil spring system replacement

A home owner from Arlington, VA says:
I have BF Rich Cabernet window that I had replaced in December of 2011. The spring that connects to the right balance shoe needs replacing. I have attached a picture of the shoe and the other the piece the spring connects to. And can it be replaced or should I replace the connecting parts also?
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Bob from SWISCO responded:

Thanks for writing in. I can't be certain without seeing the shoe out of the window, but I believe you might have our 15-228. You'll have to remove the pivot shoe and compare to confirm. The identity of the pivot shoe determines the identity of the coil springs used. 

Our 15-228 uses either our Series 160 1/2" wide springs, or our Series 165 3/8" wide springs. You'll have to remove your existing coil spring from the window and compare its width to see which Series you need. Look for a stamp code on the spring tape that indicates what spring weight you need. If there is none, or you are uncertain, give us the exact weight of your window sash, and we'll work out what you need. 

If the housing and shoe are undamaged, there is no need to replace them. The housing is our 15-150S

For information on how to remove and replace your coil balance system, see the video below. 

A home owner from Arlington, VA says:
Attached is a picture of the shoe. The spring is 1/2 in wide.The number on the spring is hard to read but looks like AT 5232208. there is also the numbers 7.5 35". the window sash weighs about 16 lb.
Does it take special equipment to install the spring into the shoe?
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Tom from SWISCO responded:

Thank you! Since your spring is 1/2" thick and stamped with "7.5," I think our S160-7 is what you want. This is fully compatible with your 15-228 shoe. That "T" shaped tab at the end of the spring just snaps into the shoe, no special tools necessary. You can do it by hand.

Please let us know if you had any questions!

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