Well, gentlemen, I can finally gloat over my Holdridge 3D, it was on EBay with seller with bad reviews but i got it for $300, which I was happy to pay. I contacted him before bidding, Eprey had cancelled the sale and refunded the buyers (for this actual item) money because of no contact or shipping. I contacted the seller and he was honest, no stories, old guy who said he got sick, was winter, stuck in house and after a while forgot. I took a chance and got it. It was cheap because it was advertised a Ralmike radius cutter, but was a Holdridge and nobody realized It.
I was looking hard at Mesa Tools cutters too, same insert and holder, and by coincidence saw DarkZeros postings. I cut mine down and used them to make a couple of balls to teach myself how to use the cutter, I can tell you they worked wonderfully on 12L14. (I know, it cuts sweet.)
Good luck with yours, both of you, Yes the Holdridge is a delight to use.
bill s