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Ah yes the Swiss army knife of shave brushes. I am afraid the the shell case would be too short to take a regular straight razor. How about a custom shorty? Then you would have to forget the shave...

Why cut the case down? You could make the bottom part a holder for a stick of soap. Yea I know we are really reaching for it now.

Bob

You are going to have one heck of a big bowl lathering brush there considering the shell is 137mm long. In another thought you could even swage the neck open a bit more and get a larger than 25mm...

Well, since any shell large enough to hold a decent knot is likely to be heavy even empty, how about using expanding foam insulation to fill it with. You can set the depth of the knot by easily...