Spiral balance tool?

A handy person from Edmonton, AB., Canada says:
Hello, I need to replace four lower balances. The existing bushings are dark blue in colour and broken. the lower windows weigh 21 lbs each.
I am assuming that when your literature refers to charging the balance that would be the same as "pre-loading". I will be using 2 pliers to accomplish this. Is there a tool I should consider purchasing to make this easier. The windows are "tilt" type and the spirals have two pins. (5/8 x 20")
Thank you for any help you can provide. (series 600)?
A handy person from Edmonton, AB., Canada says:
Hello, Me again.
I watched the video by Mike and answered my own question re: a charging tool.
I hope this is a more viable question.
Where should the pivot shoe be located when I attach the rod. I suppose it doesn't matter if the balance needs to be adjusted. I will make sure the window falls down and then tighten as necessary.
Thanks again.
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Tom from SWISCO responded:
Hello! Yes, the tool in question would be our 75-006. As for where to place the balance in the shoe, it actually doesn't matter. If you want to be 100% sure you're doing it right, you could just put it in the same slot that was used before.
A handy person from Edmonton, AB., Canada says:
Okay, Thanks. you missed my question but that is clearly my fault. because, my question should have been "What colour (Canadian colour :). ) should the bushing be now?
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Donna from SWISCO responded:
Hi, Sorry we missed that part of the question.

A pair of 20" Series 600 with a Blue Tip, will carry a window sash weight range of 10 through 29 pounds. So yes, stick with the Blue Tip for a window sash that weighs 21 pounds.
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