Previously frustrated with this I put in on the shelf for a year.

Trying again, rounded the nickers, sharpened them to 10,000. When you install them the ‘flat’ side goes out from the groove which creates a groove for shavings to collect. This pushes the blade out further and a wobbly edge to the groove results.
Considering putting epoxy in the bottom of the groove with cling film and installing the blade over it to fill the gap that the shavings collect in. Has anyone tried this?

The other issue is the friction, lots of it. Going to polish the outer metal faces that rub on the groove being cut. The wooden fence needs to be larger and waxed.

Any other ideas?