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Are there any screws that you could remove and see if they fit the places that have missing screws? You could also measure any screws that can be removed to get an idea if it comes close to anything

I blame the pirates. https://www.military.com/history/why-pirates-might-be-reason-united-states-doesnt-use-metric-system.html

Hi Charles. Nothing in life is 100% accurate. Tolerances, limits and fits appear everywhere – see my opening sentence. He is repairing an old pencil sharpener, not a micrometer, although even many

Littlemachineshop has an online gear calculator that will let you produce any thread desired and with any lathe: you plug in the pitch of the leadscrew and the gears you have available. But it's not

I was born, raised and retired in a metric country. For me, I can't imagine how to work with those ugly fractions. With other words, what you are used to, is user friendly. I expect, if the USA is a

Thanks for all the tips. I put a big "toothpick" into the hole and twisted, and the best I found was 0,6+ pitch on a ca 3 mm hole, and do to the big .xls from Kerry , a 1/8 is very close, and it will

You might find this useful: < https://www.gewinde-normen.de/en/sewing-machine-thread.html > Measuring small internally threaded holes is tricky. If you have a screw? that fits reasonably well, its

I can see two problems with metri system is there nothing like a inch. If metric had constructed units base metric. Like 25 mm and use as 1 unit . Maybe say mi so could say I need 4 mi witch is

Ellis: However, that is not actually cutting the odd thread.? It is just cutting something close enough to be "good enough".? While t is a valid solution in many or most cases, it is not actually

The metric system started in Germany 1872.

Ehh sort of. The official definition of the inch is now 25.4 mm, and has been since 1959.

It was surprising how mush of metric system was designed in America and later was ISO standard. Try this size most metric bearing? is just little smaller than inch. So could machine the metric

Hi Charles. I don’t think it is too difficult to cut ‘odd’ threads on the lathe. Given that for most purposes 60 – 70 % contact is good enough. For a friend who was restoring an old toy steam

??? That's one cool looking unit ya got there . If ya can find a Patent # on it maybe ya can look up that # & get some more info on the unit . What do ya think the short pins on the top by the

Don't know if this helps. Did a bit of Googling. Dates on the sharpener are kind of hard to pin down. Saw "1920s", 1890-1919, 1910-1928... That said, according to Wikipedia: "The metric system became

I would look at old England standard screws. Metric has not been around that long. Dave

Good question.? You may have to measure threads and diameters to determine what they are.? (Learning how to measure threads is a good idea anyway.)? And whether they are odd sizes (today) or

I have got a C1900 "Guhl & Harbeck , Hamburg" pencil sharpener for restoration . Jupiter 1 Some screws are missing, and before I force in some modern ISO screws; Had Germany their own screws size 100+

Like air venting Thank you for the great photo. *? ? ?*? ? ? *? ? ? *? ? ?*? ? ?*? ? ? *? ? ? * This for DC brush motor controllers I do not know brushless motor it probably has

Years ago, I did a modification to my control board. To prevent swarf from getting to the board, I fastened a piece of clear plastic (the kind used on report covers) about an inch away from it with