A friend of mine has a bowtie that had the "D" tuners with the inserts in the neck. He purchased replacements which look original, but there are no stops so the tuners hit the screws on the inserts in one direction and the tuning pegs in the other. What's missing?
Originally there were 4 little steel "pins" that have to be drilled for in the face of the peghead. On the B string they are located at approx. 9 o'clock and 6 o'clock. They limit the travel of the cam to just a 90 degree angle. (You'll notice the tiny "tit" pin stuck on the shaft of the D tuner, above the face of the peghead. That's what actually fetches up on the pins you install in the face of the peghead, they pins don't actually touch the cam itself. In the photo below they're just above the white plastic washer.) Actually, they are just a hair wider spaced, at approx "9:30" and "5:30" to allow for the width of the pin.
On the G string, they are located at approx 2:30 and 6:30.
You can make them easily enough by cutting a 1/16" or 3/32" drill bit into two short lengths. You only have to drill into the peghead 1/8" or so, and just tap them in GENTLY so you don't split the peghead. You can almost push them in. They only have to be deep/tight enough so they don't fall out from the cam pressure, or turning the banjo upside down.
These frequently are forgotten/lost when someone removes a pair of Kluson D-tuners.
If you make your own, just make them look neat and small.
Edited by - The Old Timer on 12/20/2022 13:10:08
'2019 Huber VRB-G Truetone' 21 min
'HC Nelsen 6 string ' 2 hrs