Just thought I would share some info on how you can rebuild rear sight elevation pinions "if" you can find the parts and have the tools. The drums are next to impossible to find and are the part that wears out. If the detent/tit is not sharp it will not engage the receiver serrations and will only hold elevation if overtightened and will be very hard or impossible to turn the knob .
These are a set of Danish Elevation assembly tools that was graciously given to me by a friend

Setting the pinion in the disassembly holder tool with the disassembly tool on top. A sharp tap with a hammer disassembles the pinion


This knocks out the cone shaped dog retainer which holds the assembly together

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