Looking forward to this thread!

Here's mine: Its a V-block set that can be used as an angle as well…

A steel safe

When I bought the house the owner said do you want it

I said yes. Then thought what a dummy I was to do that.

Now it's an anvil, a welding bench, has a big 5 inch multi-angle vice attached to it and the front door frame is a 2 ton hydraulic press frame

A small Swiss Army penknife that is on my keyring. I use it everyday from letter opening to peeling fruit. It has a pair of tweezers that are brilliant for splinter removal.

In the workshop. I have a magnet on a 2 foot long handle, and a smaller one on a telescopic handle.

I agree James, especially the stainless steel ones. Just be aware that some are "double butted" with 2mm dia. ends and a thinner, around 1.8mm, centre section. I kept some non-stainless ones years ago and they just went stupidly rusty.

Ice Hockey pucks. They are useful as:

Bench blocks -Easily cut or drilled to hold small parts while fling or drilling – non marking
Hand "mallet" for tapping items into position
Jacking pad under trolley jack – stops marking and is anti-slip.
backing when center-popping / drilling / shaping thin material
Vibration damper eg when milling etc

Cheap enough to be disposable.

Robert G8RPI.

And a pair of them screwed to a chunk of motorcycle tyre make a good bell silencer:

you can just see the cross cut in the bottom that fits over the ball of the clapper. The whole thing is then rotated to silence the bell when needed. Works well on small bells!

I think the Wave is the best value and most useful tool I've ever bought. It was so essential when I worked as a recovery driver that I couldn't be without it, even after breaking a couple of blades. When I stopped doing that job, I sent it back, and got a new one by return of post. Considering that all three blades were broken due to abuse – like prying off a damaged Krooklok – I thought that was exceptional service.

Neil said in the Magic Parallel MoleGrip thread that he used a little adjustable when having to use the long arm of a hex key to reach a socket-head screw.

I use a silver steel extension rod I made 20-odd years ago for a drill as an extension lever for the short arm of a hex key when I need to use the long arm to turn a socket screw. I use it whenever I'm mounting or dismounting the Myford vertical slide on my Warco lathe, which is very often.

I can't even get the long arm of the hex key into the screw head concentrically 'cos of the vice on the slide, so I use a ball-ended hex key. Be aware that not all hex keys sold as ball-ended really are. The Lidl variant I have doesn't really work at the 8 or 10 degree angle I have to use – the Rolson does, and has worn well.

One I had but lost many years ago, and bought from a filling-station shop. It was a screw-grip comprising a plastic tubular clip with claws, that slipped onto a screwdriver to hold the screw – same task as Luker's "Press-stick".

'

Currently though, not one but two child's beach spades!

The smaller, bright yellow (helps deter the workshop elves from attempting to hide it), polythene, about 8" long, is ideal with an old paint-brush for cleaning the lathe chip-trays – the reason I bought it.

The other is much longer and less useful in the workshop though it will reach the distant recesses of the Harrison lathe's tray. Its handle of real woood and blade of real steel show the age of this family hand-me-down. Indeed it may have been new to me originally, some 60 years ago. The handle top broke aeons ago – well, it was a plastic moulding after all. Its main uses are in the garden – anything from clearing cats' little gifts from the lawn, via planting seedlings to giving dead frogs a respectful interrment.

I have had a leatherman of one sort or another on me pretty much every day since 1996. Normally two, one being a Micra. Pretty much the only time I don't have one since 2001 is when flying on commercial aircraft. Since 2018 I've been carrying a Style PS when flying as it is generally considered OK. Current daily carry is a Charge TI. I didn't list this as I don't consider it unusual, more essential.

There is one potential issue though. As it has locking blades, even though they are under 3", it is illegal to carry one in a public place without good reason. Ultimately the courts decide if your reason is good.
To avoid any doubt I cut the locking tabs off the two knife blades on the one I carry.

Robert G8RPI.