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I have posted on a few forums about reverse engineering the 98A sight.
I have a complete set of drawings and have actually made a couple of sights, one of which I have on my early 1936 model 71.
I will send you the info on the screw if you PM me your email address.
The screw is a modified 4-40 and the nut is made by drilling and tapping a screw head.
The modification to the screw is to center drill the end of the threaded section, 0.030 dia by 0.020 deep.
This mod is necessary for the flaring of the screw end after the nut is installed to keep the nut from coming off.
The screw is in fact used to adjust the windage. If it was screwed down too tight, it will not function. The sight base has half the screw hole and the windage piece has the other half. The sight base is threaded, but the windage piece is not. It's not threaded so that the screw can allow the windage piece to move.
Bob Nisbet
 

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I am waiting for the call.
In the meantime, here is a bit of the info:
There is a thumb screw that is used to adjust and hold the sight base down.
The elevation thumb screw goes through the sight base and into a special nut that is captive inside the bolt. If there was originally a bolt peep sight the nut will be inside the bolt. Some model 71s were delivered without the bolt peep but still had the cutouts that would accept that sight. Those may or may not have the special nut.

The el. screw engages the special nut which rides above the firing pin and in fact touches the firing pin. Proper installation of the elevation screw requires disassembly of the rifle and removal and disassembly of the bolt to gain access to the underside of the screw. With the bolt on a work surface (after bolt disassembly), the elevation spring is installed under the sight base, then the elevation screw is installed and screwed into the special nut until the threads protrude just a bit beyond the nut. At that point, the end of the elevation screw is flared to limit its travel and keeping it from coming all the way out.
Disassembly of the rifle is not difficult, but reassembly will require knowledge of a trick or two (necessary to reassemble the trigger group with its pre-loaded sear spring. Note: Early model 71s have a single piece trigger and later years a double piece trigger was used. The single has one spring and the double has two springs. )
In addition to the sight, I documented the disassembly/reassembly instructions (with tricks explained). I would be glad to send out an email version of the instructions to anyone desiring a copy.
Bob Nisbet
Redstone Arsenal, Alabama
 
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