Rubber Lever End Thingies

[pdedse]

RLET...you either get them...or you don't.

My concern is this: does one pluralize the abbreviation "RLET"...or not?

I mean "Thingies" is already plural, so it should be enough do say:

"Should I go with the visible or invisible RLET?" (with no "s" added)

Yet, it seems much more natural to pluralize the abbreviation, and therefore in answer to the innocent question raised above, one might hear:

"The problem with invisible RLETs is that they are hard to see on the floor if they should happen to slip away from you upon installation"

And another thing that perplexes me: If (and that's a big "if") it is correct to pluralize RLET, do I capitalize the "S" and make it "RLETS" or use small "s"? Sorry, this latter questions likely deserves its own thread.