I have a question about the tightening and loosening of the serpentine belt tensioner. I am aware, based on my readings and research that the 13mm adjuster nut/rod is a left hand thread(lefty-tighty/righty loosey) but I'm not sure about the 19mm tensioner nut's threads. Is it a regular right hand thread (righty-tighty/lefty-loosey)?
The PO must have over-torqued the 19mm nut at the center of the tensioner because I can't turn it on either direction, so I want to make sure that I am turning it on the correct direction to loosen the nut without stripping the threads.
Any help and assistance is greatly appreciated. Thanks in advance!

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'85 300D Turbo - CA Version