Keep in mind that a bolt on any tensioner loosens in the opposite direction from how you push on it to release tension and put the belt on. that way you never loosen the bolt while trying to put the belt on.
All other pulley bolts on our cars are standard thread.
So this bolt in the tensioner will be "Righty loosey Lefty tighty" as like say my Acc. tensioner pulley was.
1998 GS with Open cone, PLOG, ZZP Catless DP, tune & Intense MPS 3.6. Pulls good enough to make the woman smack me and call me a D!*k.