You don't have to over engineer a simple replacement of the sight. When I built my semi 1928a1 SBR , I used 8p box nails, ground the heads down, cut to a length that would work. I used a piece of 1/4" steel plate for a bucking bar and pinned the inside into the recess in the receiver. They are there to stay. I posted a picture of the job on Weaponsguild. Weasel