Make sure to do it with the head button off the engine. Don't want to risk getting jb-weld down inside.If the glow plug is still good ,you can JB weld it in ,they use JB weld as a filler when modding engines ,so it
sticks real well ,it has to cure for 24 hrs ,that will get you by until you find a new one!
Your not going to damage that one anymore than what it is ,I would give it a go!...