Hase , pendulum pedal crank shortener

Hi, I’m having a full knee replacement in a couple of weeks following an accident.
I’ve been recommended to get hold of a Hase pendulum pedal crank shortener. This will be attached to my crank and enable me to ride myself into reabhilitive fitness.
Therefore,anyone goy one for sale for a left handed crank?
Cheers.
I’ve been recommended to get hold of a Hase pendulum pedal crank shortener. This will be attached to my crank and enable me to ride myself into reabhilitive fitness.
Therefore,anyone goy one for sale for a left handed crank?
Cheers.
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The main issue seems to be the width of the cranks as modern ones can be too wide. I've got a pair knocking about you can have for what I paid for them second hand (provided I can still find them).
They're this style, but I think a bit wider and a little less agricultural looking.
https://www.dutchbikebits.com/crank-shortener
Thanks