only the top section of the eclipse ones unscrew, so yer in a way u can change it, and i agree that the grip ones are a pain in the ass if you tighten them up to much to stop ur hopper from moving when u come to unscrew it they tend to unscrew from the top of the body, has only happened to me once but apart from that theyre ok. i just put a little bit of loctite on the threads to stop it from unscrewing.