Hard to keep attachment in the right place and locked on [SEP] I keep having issues with the attachment turning when I'm using it,  making it difficult to aim at the correct teeth/gum. Then when I try to carefully focus on it,  the attachment pops off. This is bulky,  and I was okay with that... because I know it needs the room for a decent amount if water.  But issues with the attachments spinning and popping off consistently is super annoying and not working. May need to return... I'm not sure if it's just this one,  or the model in general.