Getting close.

Time to take out the Marbles rear sight. Simply turn the windage screw counter-clockwise and you'll see the base move left. Keep doing this until your fingers bleed. Get a band-aid an continue until the sight is free of the lip. Pull up and out.

Anyone know - are these Marbles sight sets worth anything?

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Reverse this process to install the new sight. This one was from ebay for $45.00. Not too bad, but it feels like its spring may be sprung. We'll put that on a later "to do" list.