Re: Cassette torque measurement.
My first cassette torque gauge I made myself out of bits found at home. The spring came out of a Biro pen and the indicator pointer was from a paper clip.
This was for take up torque. I made another with a stronger spring (more up market Biro!) to test fast wind torques. The weakness of the simple design is that it stalls the spindle. You have to read it quickly before the End of Tape function shuts off the drive.
The other pictured is a professional Betamax torque gauge made I assume by Sony. It was sluggish when I first tested it a year or so ago so I dismantled it and found the oils in the mechanism had thickened, making the readings unreliable. A little cleaning and some light oil and it works well now.
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