What is it? CXXIV

721. I think it's for grinding IC engine valves by hand.

725. It's not all their. It should have two rubber pads, > The latest set has just been posted:

721 Valve lapping tool for engines.

722 Fuel checker for a Cessna. Push it into a fitting on the fuel tank sump to drain a bit of fuel so you can look for contaminants.

720 Chastity belt for a man 721 For hand lapping cylinder head valves 722 AA approved shot glass 723 NFC 724 Strap wrench without the strap 725 Tool for installing grommets or buttons

725 is missing foam rubber pads under each of the metal "buttons". I know *exactly* what this is, it's a clamp to hold your nostrils closed.

723: Travelers portable security lock for motel/hotel doors.

The tab on the large flat piece goes into the door frame latch and the pin (it's spring loaded) then goes into the appropriate hole in the serrated groove to hold the door closed.

725: Adjustable nipple clamp - it's missing the rubber pads. Usually seen in pairs. Don't ask me how I know.

Carla

71) A candlestick for people who burn the candle at both ends.

I bought a bunch of those clamps with the rbber pads from a fellow who rebuilds guitars and banjos. I use mine for building RC planes.

720- gate latch lock 721- valve lapping stick 722- fuel checker for aircraft fuel tank (check for water) 723- Some sort of lock template???? 724- Tool for bending tang on clockwork spring 725- Cam action clamp for???

I think 720 might be a device that can go over a door handle and be locked to prevent the door handle from turning.

720. I dunno, but if anyone can tell me for sure what THIS lock was intended to secure I'd be grateful:

I've had it in my collection of techno oddities for about 30 years, and as yet I haven't received a confirmable answer about it. The antique shop owner I bought it from had no idea what it was used for.

I 'spose it could lock into a groove on a shaft to keep the shaft from being slid out of something, or keep something on the shaft, but that's about all I can think of.

It has no markings on it and looks hand made, so it might just be a "master piece" created by an apprentice locksmith as his "thesis presentation", and had no particular practical application.

Jeff

Well, if memory serves me, is it not a kingpin lock? The king is the part of the trailer that attaches to the 5th wheel of a semi truck. I used to drive otr and had one in my side box. Never used it cause I never dropped my trailer that wasn't in a secure place. I never really measured the kingpin or 5th wheel, or even the lock. That's just sort of what mine looked like.

Oooops, I thought you was talking about 720 of the puzzle. Sorry. Might ought to start reading a little further down.

According to R.H. :

O.K. Posting from rec.crafts.metalworking as usual:

720) It looks to me as though it is a locking anti-theft cover for something like the fittings for filling a LNG tank, or perhaps an above-ground gasoline tank.

You unlock it and slide it off to gain access to the wrench fittings to allow refilling.

721) Hmm ... a bit short to be a massage roller for people's backs.

It looks like small suction cups on the ends, so I will guess that it is for positioning glass in a window or somewhere else during assembly or repair.

722) Assuming that the apparent taper is really from the perspective and that it is in reality a cylinder, I would suggest that this may be a piston for a dashpot assembly.

Or perhaps a float operating a valve.

723) looks like fittings for supporting a shelf in a bookcase, allowing fairly precise tuning of the height of the shelf. The cylindrical part would fit into a hole in the upright dividers, while the "button" end would fit into the stepped V-slot and be slid in or out to select the desired height.

724) Looks like a tool for bending a sheet metal tab for some function or other.

Or -- it might grip a bent-up flange on something like a radiator cap or fuel cap to allow turning it easily. I would suggest aircraft, except that cast iron seems to be overkill for the purpose, and an aluminum tool would be better suited.

725) It looks like a small spring compressor. If it were able to open wider, I might suggest that it could be used to couple flanges on the ends of tubes.

USAAF suggests "United States Army Air Force", from the days before the Air Force became a separate branch of the military.

Now to see what others have suggested.

Enjoy, DoN.

725 has had several plausible answers, but not the one I think I remember--hanging up film to dry. (and, yes, I agree that it originally had rubber jaws.)

722 - Light aircraft fuel tester. The pin works a drain valve under the wing, then you can draw off a sample and look for water contamination.

I think it's a bit small for a kingpin lock. The center hole is just about one inch diameter and a link from another poster here shows what appears to be the same No. 720 puzzle object having a 2.86" inside diameter.

Just for s**ts and giggles I stuck it in my pocket this morning on the way to work and tried it on the neck of a regular ball type trailer hitch on one of the vehicles in the parking lot. As I suspected, it was too small for that too.

Jeff

Jeff