Kimber 12tc questions

Are the connectors generally soldered or threaded? Are there any indicators how to tell which without peeling casing back enough to tell. BTW, how do you peel this sleeve back without damaging it? Are there any situations that have been noted that the banana plugs used by Kimber aren't standard sizes? I am unable to secure the banana plugs into the my nad m22 terminals; the plugs aren't tight and come out effortlessly.
C4c6a977 8dbb 4eb8 837f 31b1b4410665mesfen
Post removed 
@mesfen - I agree with Elizabeth -  I would replace the bananas - if the ones you have are not exactly 4mm dia - you will always have an issue.

I prefer the KLE Innovations Banana plugs...

They do not lock like the WBT, but they have an extremely snug fit and work extremely well.

Thanks all; will try the wbt plugs