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Good eye. For me and every barber I've ever known, the TPT is done by using your thumb or any finger pad (moistened or dry) drawn along the edge; not across it as in the wiki. The '61 barber manual...

Cut some strands from an old brush, cork one side two or three times, or just cut 2 or three slivers from a sheet of notebook paper maybe (like some fellows test knife edges)?

One way to "calibrate" your TPT "feel" is the way I use when teaching someone to hone knives.

Take a DE blade and do one shave with only one side of it. Remove the blade. Even a brand new honer...