The link below is the original design that has been in use for quite some time. I have also made a 3rd type
shown in the second link below. It can have as many stops as you want to make up.
I really like the one with the interchangeable stop rods. However it is not always on the lathe.
My original two shown in the first link are ok but I wanted them to work a bit faster than the bicycle clamp.
These are both configurable for a right side or left side carriage stop.
I removed the bicycle clamp, threaded the body 1/4-20 and made a knurled knob. The knob is good and fast but not quite tight enough
so I added 4 holes in each knob for a 1/4" tommy bar. The two allen cap screws that can be seen from the top side are only used for guide pins.They are not tight but quite loose. They do not need any adjustment when installing or removing the stop. I like the update since it is faster to set up than the bicycle clamp and the bike clamp could be a bit cumbersome to set up. The tommy bar has some surgical tubing on the end for a soft handle.