I have several candidates:-
(1)Using a sheet metal screw (the ones you use for metal roofs) mounted in the chuck of a drill press, to fit an IDC connector to a ribbon cable.
The connector was in the small acessory vice belonging to the drill press, the screw head placed on top.
Pulled the lever down--- worked better than the proper tools do!
(2)My Shift boss & I arrived at work to find the big papier mâché air duct connecting the socket of a 6166 PA tube to the air blower had broken--- no air, no HT, no RF!
Off to the hardware store, dug through their assortment of plastic drainage pipes, selected some likely bits.
Back at work, a little work with duct tape, a metal brace bent up to hold the whole thing steady, & back on the air.
(3)Many years ago, I spent a year in England.
One Sunday, I grabbed the little Ford Popular, and headed off some 70 miles to London, to buy some "Colonel Sander's Kentucky Fried Chicken"(KFC to you youngsters).
Part way back home, the "Pop" coughed, died.
I had a look in the car for tools, found a small, sloppy, adjustable spanner, & a screwdriver.
The latter did the job to open the fuel pump--- no blockage there.
After checking spark, etc, it was back to the fuel system.
The fuel pipe was connected to the carby by a "banjo" connector, held in place by a hollow screw incorporating a filter.
This was much larger than the little spanner could fit, so I trudged up the hill to an open Service Station (not always a sure bet in 1970s Britain)
The owner heard my sad tale, ordered a tow truck to get the car to the garage, & we sat down to wait,having a "cuppa tea & a yarn" while we waited. (I did say it was Sunday).
After some time, I decided to walk back to the car & wait there, whilst he rang the tow people again.
Stood around, got a bit weary, so decide to unlock the car & sit.
To this end, I took out the keys, & noticed the crown seal bottle opener attached.
Just maybe?
Yep the bottle opener fitted the "hollow bolt" perfectly, I removed & cleaned the filter, & a few minutes later,
pulled into the service station.
The owner was on the phone again to the tow truck people.
He said,with icy sarcasm "Don't worry about it, the customer just drove in!"
I tried to insist that I pay him, but he wouldn't take my money, saying "I didn't do anything!"