balance shoes don't slide freely

A quick learner from Boston says:
Hi - after removing the spiral balances, one pair of the shoes slides very freely in the channel, the other is very difficult to move. Is this normal? Should I replace the shoes as well when I am replacing the weights (there are no slots, so I'd need to use a spreader to remove the old shoes).
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Paul from SWISCO responded:
First, check the shoe to make sure it is not in the locking position. The slot in the cam on the shoe should be in the horizontal position--that mean's it's unlocked and can move freely.
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