[Spridgets] Removing a cut-off bolt.... Ideas??

[Dave G.]

My beast is a '65 Sprite.
On the drivers side of the tunnel is/was a place for the seat belt securing bolt.
One of the DPO's has cut this bolt off (!) leaving less than 1/8" of bolt 
showing... and then painted over it...
I would like to solicit ideas on how to remove this sawn off bolt so I can use the 
built in threaded part to install some proper seat belts...
I have no power tools --- only hand tools.

If this seems like a impossible task, has anybody had any experiences with the 
Moss Motors "Hook mount" or "snap mount" seat belts...e.g. their part #222-
239??

TIA....

--
Dave G.   KK7SS
'65 MK III Sprite in Richland, WA
"Real stupidity beats artificial intelligence every time."
    Terry Pratchett, 'Hogfather'