I pulled the plate to replace the timing belt and there are two metal inserts. One is where the auxiliary tensioner pulley connects, and one is where the top bolt under the cam cover connects. I could spin them freely by hand. I tightened them before reinstalling, but now I’m wondering if I was supposed to leave them alone. I don’t understand why 7 attachment points are fixed, but 2 have an insert with adjustable height - any ideas what these are for?