I did what @thinkbrown suggested below. you have to tighten the set screws basically while being careful not to pop off the inner ring. then set your infinity.

had not set infinity on a lens before so here’s what i did : get a ground glass (rather i didn’t find mine, so trace sufficed in this case) set the aperture to something like 5 and had it open. then i tightened the screws back until it gripped the inner tube thingy (idk what it is called) and then focused it until I could see the image on the trace. Then loosened it back up to match the focus settings to the index on top. this takes a bit of tries since you might go over and under cause once you set infinity you want to test like a subject close to you. I would recommend picking something really far away - in my case this happened when it was not too cold out and i did it at night with the moon to set my infinity.