It absolutely is pressed in, mine got cannibalized unfortunately, the gear is of some rather brittle material, when put into a vice it broke into shards like it was an incredibly cheap chrome type steel. Imagine the stuff the free coupon harbor freight 4 piece screwdriver sets are made of, that type of steel... Like you can bend and snap it in 2 or 3 bends.
You might be able to weld it though I have a slightly different idea should you not think it is possible or even a good idea to weld. It's not very good and doesn't stop the gear from working loose again.. I share if no hope. I think the bell sits high enough you could put tacs on it on the side with the main part of the gear, i think the other side (inside the bell) needs to be smooth and flush but I might be wrong.