balance knife lock shoe 15-014

A handy person from hopkinton, ma says:
Hi Swissco,

I ordered four of your 751 channel balancers with 15-014 lock shoe. From your video, I see how the knife blade helps lock the shoe in a down position, a little away from the balancer. When I go to put the sash back in, how do I unlock the knife blade so that the shoe will press upwards against the sash? If I don't unlock it, it looks like the 26-152 cam pivot on the sash will press on top of the knife, so that the shoe will go down, but not up again.

Thanks for your help!

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Paul from SWISCO responded:
When you tilt the sash back into place, the cam pivots on either end of the sash should unlock the 15-014 shoe. The cam pivots resemble our 26-151 and 26-152.
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