Thanks Chuck, those are great! I've never seen the AT before and have lusted in vain for an Ellte for many years, LOL.
The Precihole sight is most interesting. The funky thin aluminum attachment bar of the Williams FP series sights works well enuff if you're careful with mounting it but has never been my fave. How much tolerance does the Precihole have for minor variations in rail spacing?
The Precihole sight has a clamping arrangement like so
I opened it up to .650 and the securing screw still had good purchase in the sight body.
A few caveats to be aware of with this sight. The aperture eyepiece is a non standard thread, as in, it is not threaded for Lyman, Redfield, Williams etc. apertures, nor will it accept an Anschutz or Gehmann aperture.
The mounting base is somewhat tall as well, causing a higher sight line when the sight is adjusted to its lowest point vs a sight with a shorter profile mounting base. This MAY result in one needing a higher front sight arrangement depending on the rifle.
I forgot to comment on your Redfield sight as well. Nice stuff, and it looks like it belongs there!
Your issue with needing a higher front sight may be cured by mounting a Redfield Palma rear sight. On the Palma model, the diopter eyepiece mounting boss is under the horizontal cross arm and may adjust to a lower sight line VS the Olympic with the diopter eyepiece above the horizontal arm.
Now the deep dive.....
Redfield Olympic, International, and Palma sights are basically the same sight with some minor differences.
The Redfield International and Palma both use opposing springs to control backlash while the Olympic model lacks this feature.
The later Palma model sights also have an adjustment feature that let's you control backlash in the adjustments via screw tension, the earlier Palma model sights lack this feature.
Redfield match sights also use celluloid shims between the rails and their mating surfaces on the base. This was done for smoothness, but over time, they degrade and can cause the sight to have a hitch or some drag in adjustment. It used to be a thing to disassemble the sight and polish the mating surfaces lightly and lube them with quality grease to eliminate the shim effect when they start to get raunchy.
The problem with doing this on the Olympic model is there is no provision for eliminating any backlash or slop present in the mechanism other than readjusting the screws in the base. The screws are generally glued in place, but they are removable and you can adjust the interference fit that way.
The Palma sight will also accept standard eyepieces vs the Olympic and International which accept the Redfield eyepiece. Basically 12-40 vs metric apertures.
That exhausts my knowledge on the subject.