o thats was i was going to ask. the "hub" for the string. on mine i copied another one i'd seen using the volume knob method... but the string angle coming out is really sharp. its lasted so far, but i've had loads of problems with this and my pedal steel (admittedly going from G# to A) but this does seem to work... i didnt expect it to make a day.
Can anyone reassure me that it will be ok or any tips to modify this idea a bit.... i was thinking of countersinking the ball end so the winding of the string would take some of the strain a bit.