I just drilled a hole in the smoke chamber and hard mounted the probe. I'm talking about the temp probe that is connected to my temp controller, not the smoker temp probe for a Maverick ET73 or something. However, with a little thought it shouldn't be too hard to come up with something for those.
The temp probe I got did not have a nut so I made up a sheet metal clip and used a flat washer to hold it in place. I think it's a NPT thread, probably 1/4" NPT but not sure. Here's what I have hooked up to my temp controller.http://www.virtualvillage.com/thermo...03820-034.html
It has a stainless housing and a a platinum sensor. I usually wrap it with a little thin foil so I don't have to scrub the grease and gunk off after the cook. Just toss the foil.
Those ET73 probes come with a clip for clipping it on the grill. When I get one I might just clip it to the bottom of the grill instead of the top. I've already drilled a port on the end just below grill level for passing temp probe wiring though so I don't have to have the wire crushed by the lid. It would also tend to make a crack for heat and smoke to escape the cooking chamber.
I usually take the time to try and do something right the first time so I don't have to continually fuss with it later. I'm lazy like that.