It should go in. Take of the needle clamp, scrape out the groove in the neede bar with a tooth pick. Make sure the inside of the clamp is clean too. I've had this on both my 201s too, and all the trouble was caused by old dust and grime. I think this trouble happens when we start to oil, if it dribbles down the needle bar it makes old dirt and grime swell up. I was able to insert the needle on my, but it turned out more difficult and acted up in various ways. You could turn the clamp screw looser and wiggle it a bit too, if you already have cleaned behind there. You literally have to scrape this grime out with a pin or tooth pick, it doesn't come off with a cloth or cotton buds.
If I remember correctly the tiny thread guide part has to go in just so to work. I think it can only go in one way or not at all, but I'm not entirely sure.
Last edited by Mickey2; 08-08-2017 at 10:11 AM.