Added Shimano Di2 JC bracket mount to pedaling monitor (redux)

The drill is screaming!
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I took in a WH-RS21 rear wheel from a customer.
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Did truing and centering.

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The same customer also left me a WH-RS010 rear wheel.

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Did truing and centering.
Both had slight lateral runout, and one had a clear centering issue,
but since all the images above are after the work, I've forgotten which one it was.

As a side job along with this work, I've been asked to do something else,
and I understand—that's actually the main task here.
They want me to make a Shimano Di2 upper JC bracket
to attach to those mysterious screw holes on Pioneer's pedaling monitor mount.
The one I made before is here.
As I also noted in that post, please just buy a Reckmont.
That one has better quality and expandability.

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I'll go ahead and do it, but I'm publicly declaring right now that I will never make this again.

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They asked for two, so I made two.
The plate dimensions and bracket machining differ in various ways from my previous version linked above.

~Installation instructions below~
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Thread M3 bolts into the pedaling monitor mount,
but make sure the lengths are equal on both sides. The state shown in the image above is the wrong way.

Make sure washers contact both
the pedaling monitor mount and the JC bracket plate
by threading the nut and washer through.

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Using M3 bolt washers—
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I had a hard time finding ones with a small outer diameter.

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When tightening the nut,
the nut can slightly interfere with
the slide lock that secures the pedaling monitor,

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so orient the nut's final tightened position relative to the slide to be on an "edge" rather than a "corner."
In the image above, the left is a "corner" and the right is an "edge."

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↑It's fixed like this,

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but unlike my previous version, the blind rivet head
ended up in the same position as the lock lever,
so please adjust the spacing to avoid interference. I filed down the rivet head slightly.

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Finished product mockup.
If anyone wants the same thing made,
please do buy a Reckmont (shameless plug).

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