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pdlouche
Might be worth stripping apart to see what the crack is. The spindle lock on my Dremel 8100 started slipping recently, I took the whole thing apart, used pliers to hold the spindle to get it loosened, cleaned everything, put it back together and did the screws that hold the housing together up a lot tighter than they'd been before I dismantled it and it works fine now.
Think the high frequency vibration of the tool had rattled the screws loose which was allowing the spindle to move away from the locking pin.