Paul from SWISCO responded:
August 9, 2016
Thanks for posting! Sorry to hear about the trouble. Usually, when the inside spiral pulls out of the balance tube, it's because the balance is not long enough for the sash's movement. One way to check this is to be sure the spiral falls close to the sill when the sash is out. If so, that means it has enough travel to operate without popping out of the tube. Can you confirm the length of the outer tube for the original balance installed?
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