I had the same platter on my HW-19 before finding an original acrylic/lead Mk IV platter. It only takes a small amount of grease on the inverted bearing, and then spread a thin film of grease on the bearing spindle, but not too much. You don't want any grease to get scraped off the spindle when you re-install the platter.
You don't need to buy grease from VPI (though they will gladly sell you a small tube for $25). Any white lithium grease will do. You can buy it at just about any auto parts store. $5 will get you enough to last more than 100 years.
VPI recommends you re-grease about once a year. I prefer to do it about once every 6 months, but I'm not too religious about it. When you re-grease, it's also a good idea to put a drop or two of the synthetic motor oil into the motor to keep it running smooth and quiet.
You can go to VPI's website (http://www.vpiindustries.com
) and download any manual for anything they make for free. If you can't find one specifically for the newer TNT platter (the original TNT 'table used a standard non-inverted bearing), download the manual for any of the Scout series or the Classic for instructions on lubricating an inverted bearing.
Once you get the lubrication down and are ready for some further upgrades that will take your HW-19 to new levels of performance, let me know. I've done a lot to mine, and I know some other HW-19 owners who have tweaked theirs significantly, as well.