Michael/Joe,
The more I read about it the more cutting a slot in the end of the shaft sounds like the most practical solution. In some respects I think the Armstrong is a more substantial sight that the Lyman 48, although I have never seen one with the log range elevation slide like the Lyman. When comparing it to my M48WJS it is eveident that the windage assembly on the Armstrong is more heavily designed with machined end caps and a heavier aperature windage platform. I always thought the dual range feature was also unique.
GROGEL...do you know if Mr. Bean repairs sights or primarily a retailer? Thank you all for your input. Terry