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@Airhead
We have 5 that are all stiff to fully close. There are 2 settings though, closed with ventilation and fully closed. I always make sure the window is fully seated in the frame before clicking the locking bar into the locked with ventilation setting, then go for fully locked and sealed which is a bit more effort. There must be some adjustment in the locking mech but the position of some of ours would make it very awkward to reach. Ours are in the 10-20 year old range and they have not loosened.