Very hard to find and essential for some frames.
I have one Chater lea set for the oversized shells. I think this is NOS, but it may have been used, its condition is excellent. Includes some CL 5/16 th balls. Double or single axles available. $120
I also have two standard (BSC) sized sets. NOS. Again axle lengths to choice. Only one set of genuine Chater 1/4 balls! $70 with balls, $60 without. (No comments please!)
Shipping at cost please contact off list.
Regards
Martin Coopland