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Seconding EdT, lead seems an unlikely material. I suggest estimating the density. Weigh the part, then estimate the volume by submerging in a full container of water and measuring the volume of water that spills out.

There is a gear (properly called a "wheel") in mechanical watches that frequently has a left hand screw. Due to the rotational reasons already discussed. Sometimes the screw head is marked with three lines -- the slot for the screw driver and additional lines on each side. That might be a...

Your example 12 looks like Dumount style 5. Is that what they are? Extremely fine tips. If they are style 5, the points are originally straight. I agree, they are excellent for removing splinters. I've used tweezers to loosen the skin for a wood splinter that is broken at the surface...

I agree with the previous comments that Dumont is the best. Styles 1 or 3 are good general purpose. Plain carbon steel is stronger and costs less than stainless, but obviously you have to keep it dry. Stainless is also very high quality. Can be found used on eBay.

Khrushchev changed to non-communal apartments in the early 1960s; the apartment type is named after him. Typically five story walk ups, many of these have been torn down for larger, more modern buildings, post Soviet Union. They also had and have an advanced space program. And large...

Here is a Goodell-Pratt drill. As Dave said, they were purchased by Millers Falls in 1931, so more than 80 years old. I guess this drill to be older. The handle has a patent date of March 31, 1896. I think the chuck has a patent date of 1895, but its hard to read. The style seems very old...

Re the vintage: Wikipedia says that Stanley owned the Yankee brand from 1946 to the early 2000's.

I second that Dumont tweezers are the best. Used by watchmakers. Plain carbon steel is a bit stronger than stainless, but you have to take better care of them.

I have prescription safety glasses with side shields. I find them more convenient then wearing googles over regular prescription glasses. I wasn't able to find ANSI safety frames locally, so I bought them online (http://www.rxframesnlenses.com/) and had the prescription filled at my...

If you measured the diameter of a strand with a micrometer, and reported the number of strands in a conductor, the equivalent AWG of the conductor could be deduced. Still reasons not to use it: other unknown characteristics and lack of markings not to code.

The Starrett Builders Tool is adjustable, and so the angle will be as accurate as you can read the scale. If you want a very accurate fixed square, perhaps the Starrett large 24" combination square...

Call them tomorrow. Explain and probably they will give you the discount.

I have the full box. The box is labeled Grobert USA; Carlstadt, NJ and Toronto, Canada. The COO is not apparent to me.

Grobert Swiss is very high quality. Maybe they were always actually made by Vallorbe? "Grobet USA" and "Grobet" seem to be different companies. "Grobet USA" seems to be sourcing some files from countries other than Switzerland. There are internet reports of Italy, India & China. I have a...

Cost difference: the basic inch one has blades for 52 different threads, the metric 24. It states "Made in Germany. Model 44D .... premium USA model made by PEC Tools."

Can anyone identify the maker of this vintage, small ball-peen hammer? The The first photo has a 6 inch ruler for scale. The handle looks to be oak. The head has a design, the only part that I can make out is "H".