Hi guys - what a great forum, picked up a couple Del Rays this year and loving 'em.
I've seen a post or two here mentioning the roller bridges on Teiscos, with advice on lubing the saddles so they "roll" better.
From what I've seen, Teisco had two main roller styles; one (less used) being similar to a Gibson bridge, with intonable saddles that have integral rollers. On most Del Rays you'll see a bridge that's comprised of a long, threaded bar running perpendicular to the strings, with round "rollers" threaded across it, one for each string.
Those saddles aren't intended to "roll" when the whammy is used; they're how you adjust the intonation. By rolling them, they move across the threaded bar (much like a hex nut would), across the axis of the strings. Doing this changes the length of the string (albeit subtly) but enough to affect intonation. 
You'll note that they don't roll with whammy use; the string slides across them, and their rounded shape keeps the string from breaking or hanging as it would on a "normal" notched saddle. Graphite, chapstick, etc. will allow the string to slide more freely over them. If the bridge on your Teisco/jap electric is pitted or rusted, check the rollers for a smooth string groove and clean/sand/replace as needed.
It's really not a "bad" system, and upgraded nut & tuners can help. If you're into Jeff Beck-style whammy "expression" (vs. dive bombs), you might try removing the bar and slightly bending it towards the body, where you can keep a finger on it. 
It's not a vintage fender trem, but I really enjoy mine; guitar fetish sells a nice replacement for solid guitars, which you could screw onto all kinds of axes. Hope that helps someone out!
			
		

