PS Do you have any additional special advice or warnings about putting the adjustables on a fixed sight gun? IIRC, the doesn't have that same T-shaped piece for the vertical adjustment screw to engage, so it should be easier to install than a K-frame or N-frame set.
Froggie,
Yes I do and you're exactly right. The I and J frame Micro click sight is a much simpler installation than the K & N frames. It does not have the T-shaped vertical adjustment piece nor therefore, the intricate milled slot. It simply has a shallow 1/8" hole with a small disc with notches in the top surface that just lies there. The vertical adj screw has a knife edge on the tip. The engagement of the two under pressure from the sight tang produces the 'clicks', more or less, actually detents.
The best advice I can provide for doing this installation is to have a post war Micro click sighted Model of 1953 'NEW' I frame .22/32 in hand to measure and replicate the milling cuts properly. The milling cuts are at two levels; the tang cut and the lower level cross cut over the hammer. That's where the mistake was made by whoever did the milling on my .32, which I had to re-mill.
Micro click sight choices:
There are three I & J frame post war micro click rear sight sizes (over-all length):
1. The 50s I frame =2.390-95" this one has the front mounting hole 1/16" further back and best for a pre war but hardest to find. It's too short for a J frame.
2. The 60s and 70s J frame = 2.530-5" M 36-1 (1975) and 22/32 M 34-1 (1971).
3. And the most current J frame = 2.718" my M 60-4 (1990), my M 36-6 (1986) and 22/32 M 34-2 (1980), and the M 63.
The current 2.718" will work fine however. The front mounting hole will be located over the barrel of an I frame gun and just need a blind hole in the top strap. And of course shortening the front end of the tang of #2 and 3 sights will allow you to custom contour the squared off front end of the tang and blend to the top strap contour like the beautiful pre war target sights were. The 2.718" will probably be the easiest to find as well.
Brownells has the Model 63 rear sight assembly, black #940-000-486AD for $56.23 which would be the #3, 2.718" sight. I have other sources if you want to look for a used older sight or better price. The dimensions given in catalogs are rear sight blade heights which won't matter to you because you're making the front sight anyway. Just ask for tech support at Brownells and confirm the over-all lengths of what they have or specify by the gun models I measured above, or both.
It has been done successfully by filing and if you want some details on actually doing it that way, just ask.
Hope that helps mi amigo,