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Stuck APC-7 connector


 

Hi guys,
I'm having trouble removing this connector. I've slackened off collar 'B' anti-clockwise in the picture and it's free. Collar 'A' on the other hand, is immovable. It should slacken off and retreat back towards the 'port 1' sign when turned clockwise, but it's not. This whole assembly should really only be finger-tight, but even with an adjustable wrench on the flats of 'A' I cannot rotate it. I'm using as much force as I dare and fear damaging it if I go any harder, so something must be amiss here. I'm not sure if the flats of the brass part 'C' could be of any assistance here or not, but I'm pretty sure I've never had to do anything with this section to get the assembly off before.
Any suggestions?
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Thanks, Jinx.
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