Ball bearings type BN will do just fine, they can withstand some axial force from one side, so if you mount two in pair they will do the job , I can draw, how it's solved on my Emco mill.
What is the current mounting of the srews done on your mill?
ps. could you show pic. of thrust/precision bearings, because I don't know to which bearings I can associate them in my native language and name
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