I have a 94 Metro, 5 speed, 3 cyl. I went to check my oil and noticed the dipstick tube was wobbly. Second time I pulled on the stick, the tube came right up with it. Seems like the single bolt holding it in place has disappeared. Guess I know where my missing oil has gone :)

So, two problems:

A) What is the proper way to reinsert the tube? It slides right back into place, but is there an O ring or anything else to be concerned about at that connection?

B) What are the specs on the missing bolt, so I can find a replacement? I can't get a good look at the hole, so I am not even sure the width of the bolt, let alone the threading.

probably just shoves right in, if not you might need to fabricate something, maybe JB weld it in place.

bolt is probably a 6 mm, 1.0 pitch

I would temporarily pull a bolt like off the bodywork or something and see if it fits the hole.