There's an opportunity in this, for a clever mechanical engineer.
What's really needed is someone who can design an eyepiece holder that holds eyepieces with undercuts without pushing them off-centre or tilting them, and without the barrel jamming when removed, and with a range of different screwthreads to retrofit to the usual ranges of diagonals and focusers.
The worst are the ones with tapered undercuts.
They'd make a fortune IMHO.
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