The only breaking you should be doing to the tube, is either breaking the electron gun assembly off, or removing it attached. I've ended up doing it both ways. What I find to work the best, is to smack around the non-leaded glass (what covers the eg), an pulling the part with the glass MTP is looking for out, an then breaking it down from there. If you do snap the eg off, you can do it right above where the leaded part starts. I don't suggest this method unless you can get rid of that little bit of glass with no issue. I can. no breaking laws for me in this area. So no yelling people.
I'll try an get some pics later when I'm down in the shop. Maybe that will help a bit better. Oh on the EG assembly, it should come out as one piece, bunch of metal, etc an the glass he's looking for right there. You can see it when your looking at the EG, which is nice, cause you can determine the color, etc. They are in all the tubes far as I can tell, from the big ones to the little ones in a project screen.
The tricky part is in getting them off the EG without turning them into bits of glass dust. Pieces I'm breaking off, are coming off more whole then not, but that's been through trial an error. I just use a screw driver, an go from there. Break where it's connected to the metal an you'll have a couple whole pieces, the really hard part is getting the glass with the metal attached. Depending on the size of the piece, determines if I continue with it or not, sometimes it's tiny enough it's not worth bothering with. I got to find my needle nose, once I do I think that might make it easier breaking the glass he's looking for off. Their small enough to get in an twist that metal off from the other.
Hope some of that makes sense...if not..well, chalk it up to the rain.
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