AFAIK the only current scopes where you can't use an anti-rotation pin are the new Swarovski ATC/STCs. I didn't suggest doing without. You're flogging a dead horse here, Bill. See post #5.
Post 5 is more misinformation. There's no special knowledge needed to attach a plate to a scope and you should not be implying that there is to those seeking advice.
For those wondering what John means buy “doing something wrong” in Post 5, here’s his instructions how to do it “right”, from a recent thread that I regretfully let die:
“
The answer is to junk the adapter (the ¼ to 3/8 bushing - BA)
and use a QR plate with a 3/8" screw. Even the suboptimal Manfrotto RC plates with their rubber mating surfaces were available with 3/8" screws and this applies to most Arca-Swiss compatible plates.
Moderate torque (for the thread size) with a coin slot, or even better with a 4mm Allen key can generate a high compressive load between the metal surfaces of plate and scope foot that nothing will come undone. There is then no shear load on screw or anti-rotation pin. The friction between the two surfaces is akin to that between a car wheel and hub, which carries the load and transmits braking torque. Loctite is completely unnecessary.
In almost 20 years of scope use with Diascope 65, ATM65 and Kowa 883 with Manfrotto RC and later Arca-Swiss compatible plates from Novoflex and Berlebach I have always used 3/8" connections and never had a plate work loose.”
That’s it. That’s John’s solution. Use a 3/8” screw and tighten it. Really tight. Amazing. Why didn’t anyone think of this before?
Unfortunately I’ve seen many done quite a few times over the years with little success and worse, damaged scopes. Even with the availability of plates fitted with a 3/8” screws and anti-rotation pins, there has been sufficient feedback on poor plate mounting issues that Swarovski, Vortex, Meopta, and now Kowa, have designs that, at least in part, address the issue. They didn’t look down their nose at customers and insult them by saying “you’re doing it wrong”.
One reason I’ve stated repeatedly that plates suck is due to undersized pins and or poorly located ones that don’t match the scope foot. I have yet to see an anti-rotation pin that fully prevents any rotation and I've seen or purchased way more plates than I care to. John fails to address this issue even though he knows it is one as evidenced by the custom one Berlabach install in a plate they customized at his request. Yet somehow his suggestion for others is merely "Use a 3/8" screw and tighten it really tight." I must admit that if I had a plate customized by the manufacturer to my specifications, I would imagine the odds are good that that plate doesn’t suck.
Now, to cut down on responses from any ankle biters that feel a need to cite exceptions - do all plates suck? No, just most of them. The Swarovski plate for their PTH head works well for ATX/STX scopes, although it will allow a minor amount of rotation. Also, scope/plate fitting generally works better for shorter 50-65mm scopes since the scope length results in less incidental contact and reduces the torque applied to the mounting screw. I use a plate to mount a 60mm Opticron MM4 to a 128RC and it works ok. I’d rather not use the plate, but it’s required. Finally, although a no plate solution is still preferable in my book, the new Kowa 88/99 series has 2 threaded holes for plate mounting. Any plates that fit your head and will take 2 screws than can be used to secure it to the scope should be good. I was able to do this while trying out a couple of 99As and it worked great. This Kowa design is probably the best overall solution for scope mounting.
There John, there’s your dead horse.
Now beat it.