Is this a thrust button and can it be removed?

jawbone said
Contacted Moser regarding axles. Axles will accept the tapered bearing if I decide to take that path. None of this is inexpensive. If I'm spending this kind of money I just want it to be right. This includes the removal or not of the axle shaft thrust spacer. Will let install of green bearings make that decision. If it must be removed I will go back to the tapered bearings. Am not going to remove it now due to mis-information. Found adjuster on DrDiff web site.

DoctorDiff has everything, he even sells heavy duty billet adjusters for the tapered bearings. Overkill for street use but a nice upgrade if you’re doing AutoX or road race stuff. Some of it is a little harder to find on his website, it used to be the only way to find the heavy duty adjusters was on a drop down if you were ordering axles.