Particularly on chronographs that may employ proprietary gaskets on the pushers.
There are some very fine watchmakers around, but if they can't get all gaskets for the watch and if water resistance is important on a particular watch, does that mean one must send their watch to an authorized service center for servicing?
I just had a watch serviced by an unquestionably fine watchmaker. It was a diver chronograph. When I got the watch back I asked if all gaskets were replaced and he said only for the case back not the pushers, and if water resistance was important on this watch then it had to go to an authorized service center or manufacturer.
So is this the general rule to retain water resistance - always send the watch to an authorized Service Center??