In article ,
says...

Steve W. wrote:

... my favorite uses a mushroom shaped plug made of rubber. ...

http://www.compacc.com/p/Stop-Go-Tub...e-Plug-Gun-Kit

That looks like it would be really effective. I'm really impressed that
it can push the plug through a puncture hole.

It says "This kit is designed to get you home or to a repair shop to
have the tire patched professionally", but I don't imagine that a shop
would be able to patch it any better. Unless they took the tire off the
wheel & patched it from the inside. Do they do that?

Some do. There's an outfit in New Haven called "The Tire Doctor" that
does, or that did the one time I had a flat in New Haven. That was more
than 20 years ago though.