When I pull out the crown to wind it, change the date or time, sometimes, a lot of the time actually, when I push the crown back in, I can only screw it back in half way. I have to pull it out, rotate the crown a little and try again. Sometimes it takes me a couple of go's to get it to screw back in fully. Is this normal? Is there just a knack to these watches? I ask, as today, I noticed my crystal isn't seated correctly, it isn't quite flush at 3 o'clock. I'm not sure it's worth posting back to for warranty work for just that. It'll probably cost the same just to take it to my local watch maker. But if I've got a faulty crown too, then obviously, it'll be going back. Thanks.