As above, there are two types and one sub-type of Colt Accro sights.
The earliest version was used in 1953 for about a year and had a rounded front on the sight leaf.
The second type had a squared off front of the leaf but was otherwise the same design.
The later type Accro had a "hump" on the rear of the leaf to give more elevation adjustment and used totally different elevation screws.
The early type of Accro screw is very difficult to find and the only known sources would probably be eBay and Gunbroker.com. There it's just a matter of watching and hoping one turn up some time.
The later type Accro elevation screws are being made as replicas that are correct You would also need the tiny spring and two VERY tiny steel balls that fit inside the screw.........
Shop for your Rear Sight Elevation Screw, Accro with Numrich Gun Parts - the world's largest supplier of gun parts.
www.gunpartscorp.com
Rear Sight Detent Ball, Accro | Gun Parts Corp. A truly ridiculous price, but..........
Shop for your Rear Sight Detent Spring, Accro, New Factory Original with Numrich Gun Parts - the world's largest supplier of gun parts.
www.gunpartscorp.com
The later screw is also available from the actual maker.........
stores.kensight.com
Here's what the Accro sights look like............
Early 1953-54 rounded leaf type. The later 50's type is the same only with the rounded leaf changed to square.
The later 50's Accro with the square front leaf. Other then the front, all parts are the same.
Later Accro with new style elevation screw
NOTE: in later versions there's a cross pin that passes through the side of the leaf to retain the elevation screw better.
