Hi Bojan,
Yes, I am experiencing some of this too. Appears to be caused by the volume of the gap between the tool and mirror changing (increasing) as the mirror moves over the tool. If there is some air in the gap, you probably won't get it stuck completely, but if there is only water, you can get a vacuum seal that is hard to break. I have read elsewhere that this is best tackled by soaking the tool and mirror in a bucket of water for a short period and then attempting to slide the pieces apart.
Regards,
David.
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