Tonearm pivot lube

As Viridian and Dan_Ed suggested, there's no generic answer to your question. It depends on the tonearm. Many unipivots are designed to be lubricated/damped around the bearing but some are not. If lubrication/damping is called for, the optimum fluid varies from arm-to-arm as well.

If you're asking about a particular arm, please identify it. There's a good chance someone on this board will have experience with it.

Of course you could always ask your dealer (if any) or the arm's manufacturer (assuming they're still around) or even read the owner's manual! Many manuals are available at www.vinylengine.com

I'm unfamiliar with the mechanics of the Bio-Tracer arm, but why would you want to "pre-load" tonearm pivots? What force are you pre-loading against? Why wouldn't you want the arm to respond to that force with as little resistance as possible? On most tonearms, the lower the friction in the arm bearings the better, in both the vertical and horizontal planes. Just playing devil's advocate...

BTW, teflon grease (or any lubricant) will be a dust collector, especially in an exposed location. Apply it once and you'll find yourself cleaning it off and reapplying it periodically, perhaps regularly, depending on your environment.

It's great to be thinking outside the box, but I'd proceed with caution.