New idler pulley not spinning

So, I may be kind of dumb here, but I just installed a brand new idler pulley and both washers are on each side and everything. But after torque down to 20 foot pounds it doesn’t spin? Is it not supposed to spin? I forget if newer idler pulleys are supposed to spin after they’re torqued down. So I took the bolt back off and put some blue loctite on it just in case because when I torqued it down tight the first time and spun the engine overk the bolt backed out. So I’m thinking maybe the threads are a little messed up also? So I figured blue loctite was my only hope. I torqued it down to 20 foot pounds. This is on a 2001 Ford Windstar. Any help is appreciated? Thank you!

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