I think you may find that the balls may not be up to the high loads multis put on them.
I know with my traveller cars I had to get torlon ball 'cause the original spec stuff used to deform.
Not to sure about the maclube idea, found it gummed up my traveller after time and we had to stip and clean. A cheaper alternative was to use silicone spray from your local upolsterer. A huge aerosol can for a 1/4 of the price
of the small maclube.
We used this on the mast but used a water/ metho mix in a squirt bottle for the traveller as the silicone is a bitch to get off if we needed to paint
aroud the traveller area.
Hope this helps