H&R Sight (continued)
If I get the pix to upload, you may be able to follow this OK
The first pix is the Rear Sight parts.
Upper center is the sight plunger and spring. The plunger is
machined to a blunt taper at one end, flat on the other.
Upper right is the lock screw found on the right side of the frame
adjacent to the Sight Screw.
In the center is the sight Blade showing the side you would see
if sighting the piece. To the left is the collar, and to the right
is the sight screw.
Lower right is the Elevation spring and plunger.
The second Pix is the piece in my gun vice, and I have inserted
tools in the holes in the frame. The bronze colored drift pin punch
is in the Sight Plunger and spring hole, It is home for the
beveled Plunger that rides against the serrations on the forward
side of the sight blade.
The top driver is sitting in the Elevation hole.The lower driver
is in the Lock Screw hole.
The 3rd pix is a closeup of the above explanation.
Pix 4&5 show close ups of the right and left side ofthe Sight"cavity"
NOTE the shoulders on both sides. Also the plunger holes and
the Lock Screw hole can be readily seen.
The "shoulders" on both sides limit the Collar on the Left side,
and the Sight Screw on the right side. Note that the sight blade
is "offset" relative to its' "threaded barrel" below the blade.
The offset accomodates the difference in thickness of the Collar
as opposed to the thickness of the sight screw.
The distance between the two shoulders is greaterthen the thickness
of the "threaded barrel" of the sight blade.
By manipulating the blade on the sight screw threaded shaft, the sight
blade can be set "Left" of center, or "right" of center, thereby
allowing a bit on "windage" adjustment.
And interesting exercise is to thread the blade onto the sight screw,
then add the collar,, and with both Plungers still out of the "Cavity"
insert the sight. By manipulating the blade on the screw, you will
see the Left/Right or middle position of the blade relative to the
center line running from front sight to rear sight.
More about installation of the sight parts is coming.
R
(I am not a gunsmith, nor do I have bona fide documentaion of the
H&R 939 sight. What you see and read are my own observations,
Caveat Emptor)