Well Tempered Simplex arm and wiring

Understood - no need to unmount anything! I see that top hole as where a screw inserts down into the ball half, then the arm tube is inserted. Of course, they could be joined with epoxy, which is what I might do. On an assembly line, screws and not epoxy make more sense... What's the deal with the small  horizontal tube for the fishing line in the ball cap? I've often wondered, does the line go all the way through? If so, how would it azimuth work if the fishing line isn't fixed to the ball? I have epoxied brass nuts in holes for use with brass screws to mount the fishing line in my 2 clone arms.

BTW, my plinth and base are drilled and bearing, spindle and platter installed and turning well. Pillar samples are drilled and ready to cut along with suspension arm for install. 3D printed cup should be here today. Suspension arm is 3" in length or a bit longer (t's silly, but why not be exact...)? Would love to send you a pic at some point.

In the past, I've used a 6mm od diameter carbon fiber rod (4mm id). 6mm us slightly smaller than 1/4". From what I see, a standard arrow shaft is 5/16" od, which would make it 7.9mm od. Any way you can confirm your arm's diameter? Also, how does the cartridge mount connect to the carbon fiber shaft from the bottom? It looks like it's carved out a bit and the shaft sits into it. Glued on or screwed on?

The small horizontal tube goes all the way thru the cap. Fish line is fed thru tube. It is then knotted and slipped back into the tube. The fish line is looped a couple of times around the aluminum machined collar that fits on the horizontal part of the gallows post. The twists I mentioned give the arm anti-skate compensation. The beauty part of this is when you rotate the machined collar back or forth by your fingers, you get a wide range of azimuth control in either direction. And you can do this on the fly to dial in perfectly. This is one of the most ingenious azimuth adjustors I have ever seen. I believe the end of the arm tube is flattened ever so slightly and the cartridge mount sets on it with one set screw. You can adjust zenith by loosening set screw and moving the cartridge mount either way. Mine came preset by factory and they say to leave it at the angle it is set at, although you can adjust it if you have to. I do not know what the factory angle of degrees it is set at. Would love to see the pics. Keep me posted.... Tim

I forgot to mention after you have looped the fish line around the collar, you have to twist the collar counter clockwise two times to get anti skate control. I believe this has to be done to make the azimuth control function correctly. This control makes the arm tip in either direction. You can tip the arm approx. 45 degrees either way. Of course you would never put that much azimuth correction to your cartridge, but it shows you just how much control you actually have.

Yeh, it's a great azimuth solution. When I modded an original WT arm and then built my own clone, I saw both partial twist and full twist online... and finally modded my arm with a thinner 1/4" suspension post, making sure to give the grommet a full twist. My original suspension post was 3/8"d and too large for the lightness of my arm.

Any chance in getting a diameter of your armtube? I've used 6mm but think 8mm might be a better choice an wouldn't mind a confirmation...

I wonder if the inside front of the arm has been filled to allow for screw threads for holding the cartridge mount. Hmm...