I need to replace the hood on a "51." I prefer to use hoods that work with o-rings: I don't have to screw them down hard (stressing the plastic) or use shellac to seal them against leaks.
I have the option of buying a shell with a fully-recessed indent for the o-ring, or a half-recessed indent.
I have no idea what the trade-offs are here. Could someone clue me in?
The half-recessed shells look a little more robust around the lip, for obvious reasons. But I am no expert. Do they completely hide the o-ring? How do the two kinds of shell work out?