There is a peepsite spring and plate under the peepsite that sit into a recess under the top bellows retaining plate which is riveted in place. You have to remove the top graflok slider to see the bellows retainer plate.

45PSS wrote:

There is a peepsite spring and plate under the peepsite that sit into a recess under the top bellows retaining plate which is riveted in place. You have to remove the top graflok slider to see the bellows retainer plate.

thats a tricky one!