Drawings from the original patent document, re-colored for explanatory intention.
8 (red): hollow screw
6 (yellow): leather washer
Patent Number 2001612 (USA)
Patent Number 341422 (Canada)
Inventor: Marcel C. H. Jacquemin (see also: Newhaven)
System patent granted in 1933 (Montreal, Canada)
Grand Slam pipes have a "*" followed by a number on the underside (*5 in the picture opposite).
The number refers to the size of the leather washer that fits on the end of the stinger.