To convert the tape unit to use DC2000 we need to do a few things. Look at CuriousMarc’s video’s and the remarks on the vinthpcom groups.
First step is to clean the capstan goo, and to extend it by 2mm. Cleaning the goo is simple with a hobby knife.
Extending the capstan was done with the help of a lathe in the video’s I watched. But I have no such thing (and that seems wise, those things are dangerous 
). So I’m trying another way..
I just made a 3d model of a cylinder and 3d-printed a set of these, all with slightly different sizes, and printed these on a resin printer with hard resin. I then selected the ones that at the end had the best size required, and glued it to the capstan wheel using epoxy glue.
The day after I connected the motor to a power supply, made it rotate at speed and used a file to remove the extra resin and glue. This should have resulted in a reasonably round extension.
Next step is the plasti-dip treatment: make the motor turn slowly, and apply coats of plasti-dip every 5 minutes with a flat hobby knife until we reach the required size (around 10.5 mm diameter):
Adding a coating every 5 minutes gets us this:
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