What's the biggest spade you can buy?

I used to have this unit and the banana connection fit very tight & sounded great. That is the best route for this unit.

Alpha Core solid silver spades may work.

Forget it. I have a Nu-Vista as well and there is no spade that will fit those binding posts. The largest spade I know of is Analysis Plus and even those did not fit. I just use spade to banana adapters.

Bare wire best? I have two concerns:

1.) Frightened that one rogue strand will make its way out to the other terminal. How can this be prevented, other than using one solid core wire? (I prefer stranded.)

2.) Seems to me that cranking down on a flat, symmetric surface (spade) can be made easier and more secure (therefore better electrical contact) than a round nonsymmetric shape (wire).

I don't know, perhaps these concerns are not valid. Prcinka or anyone?