How to install the X-50 Stiffy

Onefinity X-50 Manual located here:

Apologies if I missed this in a previous post or video, but are the rail tramming bolts actually used to “tram” the rail in the block, or do they exist more for keeping the rail from “wandering under pressure”?

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They are used for tramming the spindle:


Why a “stiffy” for the X50? When I purchased my X50 last year I got the impression a stiffy wasn’t needed (like the X35)?


Avbates, I’m right there with you.