Lyra Delos A truth teller or what?

I use the Soundsmith EZ screws, comes with different weights so you have to experiment as it will affect mass and the position of your counterweight.
I found the right combination giving me an excellent RF results. I also track at 1.75g as this is where Lyra designed the cart to perform best regarding their New Angle design.

The arche headshell comes with Brass screws which seem to be too heavy.

Tzh21y, FWIW, I tried nylon washers with the Delos. (Currently using titanium).

My main gripe with them is that they can be too “squishy” and uncertain. With stainless steel or titanium I can set cartridge position and do the final tightening within seconds. Nylon required a very slow and painstaking tightening procedure which involved tightening each screw alternately by as little as 1 or 2 degrees at a time.

Also found the nylon could easily be displaced off ideal alignment e.g. by removing replacing stylus guards or even by the tightening process itself.
As an example it wasn’t uncommon for the cartridge position to be found to drift by 0.2mm (when routinely tightening screws) when the wand was re-checked on the jig. Very easy to see. This is never the case with steel or other metal washers.

Positive aspects of nylon is that it protects the headshell veneer/finish and may offer some degree of damping (I.e. used strictly on top of the head shell, never between cartridge and head shell ;)

Sonically, there isn’t a world of difference IMO. Overall I prefer metal washers but others may disagree.
Hope this helps...

After all this I settled on loading at 320ohms.  I will try that Moonglum.