I decided to do some blade gap measurements myself on my Gillette
Tech razors and found some surprises. My new Chinese
Tech measured the same as my pre-war USA
Tech at 0.024". My
Made in England "flat bottom"
Tech was about 0.024" as well. I then measured my pre-war Canadian Tech and it was at 0.026". The surprise was that my
Made in England "ball end" heavy
Tech measured the same as the Canadian pre-war!! I always knew it was a great razor, but to be frank I had never used it that much. That will soon change.
I measured a
Lord Tech clone as an aside and it was 0.032". It is surely a more aggressive version for sure as my shaves with it have shown. I also measured a
Schick Krona at 0.025" and a '54
Super-Speed "Flare Tip" at 0.025" A shocker was the
Feather Popular, often termed as vey mild, measured 0.029".
If you torque down the handle too tight it directly affects blade gap on one side more than one would think. Here is where I will use the old gunsmith turnscrew term "snug". Just snug it up, don't gorilla it.
Blade gap is by no means an "end all/be all" answer to a razor's perceived aggression & feeler gauges are hardly NASA spec for those wanting to know precisely to an angstrom and as well depends how good the operator is. FWIW, I did this two different times with two different blades to be objective and on the USA pre-war
Tech there was a + or - of 0.002" from side to side. YMMV.