Trouble with replacing tilt window balancer

A quick learner from Atlanta says:
The window like in pic 5 will barely hold a position when open, so I thought I should place the spiral balancers.
I ordered 4 series 400 35" spiral balancers last week and just installed two on a window.
Window now can half-hold like pic5.
I wonder that i may need to change the shoes too?
Pic 1 and 2 are shoes, if I need them, please help me identify them.

I also broke a "window foot" which attaches the window and insert the shows. I don't know how to call it.
Pic3 and pic4 shows what it is, please help me identify.
User submitted photos of a pivot shoe.
A quick learner from Atlanta says:
By the way, the pivot shoe is 3/8" thick.
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Paul from SWISCO responded:
I'm sorry, but I believe you ordered the wrong balances. The S400-35 is for non-tilt windows, but you have a tilt window. That is why it won't work with your current shoes: non-tilt windows don't even have any.

I think you needed our S900-35 balance, instead. As for the broken pivot, see our 26-361 for a possible match.
A quick learner from Atlanta says:
Thanks for the reply, paul.
It looks like you are right that I compared with the old balance. S900-35 seems to be the answer.
But I have set that S400-35 successfully up by stucking it in the pivot shoe and it works partially.
What is the difference between s400 and s900? S900 can hold more weight?

Also, can you tell me which pivot shoe I should use if need some.

Profile picture of Paul
Paul from SWISCO responded:
The two balances are designed for two different types of window. The Series 400 is for non-tilt windows and the Series 900 is for tilt windows. The Series 400 is not meant to work with a pivot shoe at all, and I worry that it may break if you continue to operate it as such.
A quick learner says:
Thanks! I unstalled them.
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