Well Tempered Simplex arm and wiring

Sorry, I see you told me the arm is slightly smaller than 1/4" d... which probably makes it 6mm. My brother was bothering me about my arm being too thin (6mm) so I ordered 7mm carbon fiber rods. Probably should have left well enough alone...

Can you tell me how far behind the center of the pivot do the wires exit the arm? Does your arm shaft slide in the ball cap to allow you to position the cartridge on a Well Tempered protractor? With the cartridge mount fixed in position on the arm with no slot to make fine adjustments back and forth, I would think the arm moves a bit back and forth in the ball cap to make fine adjustments. Does your cartridge mount rotate from a screw fixing it to the arm from beneath it? I'll make mine mount with a screw down thru the rod from he top.

Can WT Simplex owner tell me the exact length of the armtube (not counting the black rubber stoppers of each end)? Can you then tell me the distance from the front of the armtube to the center the mounting bracket for the cartridge?  Thanks in advance. 

Can any WT Simplex owners measure their arm for me? I'd like to know the exact length, minus the rubber stoppers on each end. I'd also like to know the distance from the tube front to the center mounting screw for the cartridge bracket... Lastly, the distance from the tube front to the pivot point. This is for the Simplex 9" arm.  All measurements as precise as possible please.

Thanks a bunch!

Finished the table. Fabulous.