Well Tempered Simplex arm and wiring

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...

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.