Wstritt- cfb's rhyme is right, but the advise is wrong. Looking from the back, hold the knurled end thats closest to you, and turn the locking barrel (closer to the unit) clockwise.
Clockwise or counter looking at the panel?
I apologize for the stupid quesion but I have a set of MIT interconnects with locking RCA's that I a trying to remove. When I installed them, I only tightened by hand but now when trying to remove them they don't budge either way. I was going to take the pliers to them but didn't want to tighten them further by accident. I assume counter clockwise (that being how most things unscrew)but it didn't work by hand....
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