Spiral balance replacement

A quick learner from Zion, IL says:
June 4, 2017
The plastic insert in the top of the window fell in the channel and I was unable to retrieve it. Please add a caution to be careful not to knock it out. Do you have a replacement piece or solution for this?
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Tom from SWISCO responded:
June 6, 2017
I'm sorry to hear you're having trouble. I'm afraid I'm not sure what part in particular it is you're referring to, though. A plastic insert could describe a wide range of parts. Is this in regards to a specific SWISCO product code? If so, could you give me the number?
A quick learner from ILLINOIS says:
June 7, 2017
it is the plastic block that the screw that secures the top of the spiral balance to the window frame.
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Tom from SWISCO responded:
June 8, 2017
Can you give me the product code from our site? If this is not something you purchased from us, can you show me a picture of the part?
A quick learner says:
June 8, 2017
S600-35 : 35" Series 600 Spiral Tilt Window Balance

Here is the spiral balance I am referring to. I do not want to risk having the white block fall off.
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Tom from SWISCO responded:
June 9, 2017
The S600-35 doesn't come with any white block like you describe. Could you be referencing something like our 26-200 screw plug?
35" Series 600 Spiral Tilt Window Balance
35" Series 600 Spiral Tilt Window Balance
S600-35
$10.32
Balance Screw Plug
Balance Screw Plug
26-200
$0.49
#8 x 1" SS Installation Screw
#8 x 1" SS Installation Screw
33-016
$0.25
How to replace a tilt window spiral balance.
How to replace a tilt window spiral balance.
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How to Identify a Replacement Spiral Balance
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How to install the 26-200 Screw Plug
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How to choose the proper spiral balance tip color
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