Paul from SWISCO responded:
March 1, 2016
Hmm... the lock shouldn't be holding the top sash up. There could be a slight drop, but not enough to let air in. Before you start adding locks, check the interlocks between the top and bottom sash. Are they clean and free from dents? That might be what's causing the top sash to drop. Another cause is the balance. If you have spiral balances, they may simply need to be charged a turn or two. If not, they may need replacing altogether.
As for adding a lock, all locks are die cast and very similar in strength, so if the 90-278 matches yours it may be your best bet. |
Paul from SWISCO responded:
April 5, 2016
It could be your balance springs are worn and becoming weak with age. If possible, I would like to see some photos of the window track and the balances if you can. That would help us make some recommendations and finally zone in on exactly what the problem is.
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