I've got 2 yokes for the Marshall 651 for sale, left over from a machining run I had done of them. I sold a couple to operators, and I had been thinking about going into business selling these, but I've decided not to. I'm now selling them off for what I paid for the parts, since they've just been sitting on my shelf for a few months.
If you've got the Marshall 651STX monitor, this is a great little yoke. It mounts up pretty close to the monitor's CG, and allows for really easy adjustments in the field. I've had one on my sled for about a year and a half now, and I can't imagine going back to a simple tilt bracket. It's got a 1/4"x20 threaded hole in the center, and 2 through-holes for 10-32 bolts at 1" center-to-center spacing.
They were made for me by CinemaOxide's machine shop, and are anodized black. All hardware is stainless steel.
I'm asking $200 for the one, and $175 for one with a slight blemish on it (from me using it to test out a part I was machining). The blemish doesn't affect the usability, just a little nick in the anodizing.
If you're interested, PM me, email me (firstname.lastname@example.org) or call me (215-796-8938). I'm on set all next week, but I will get back to you as soon as I can.