Re: core plugs

Posted by DavidPackard On 2022/3/3 20:08:42

Here's more information about Welch plugshttps://www.hubbardspring.com/product/expansion-plugs-steel/

Certainly, more than any one person needs to know.

Note the hole geometry changes with plug diameter . . . I didn't know that!

Seems the design was by the Welch brothers, Pontiac Michigan circa 1905. Not sure I can believe the origin, but the web talks about one, or both, of the brothers fixing a car on the road with a coin. Accurate or embellished, good story anyway.

dp