Have you tried freezing the shaft? Get a duster air can for electronics and invert the can, then spray the shaft with the liquid CO2. The metal will shrink up a bit. I've gotten stuff unstuck before using that trick.
The canvas on the rack looks cool! Does it flap around like crazy on the highway? I've been contemplating making my own soft topper of sorts almost identical to what you have done. I like my fiberglass shell but it's a lot of weight.
You can definitely tint Monstaliner, and it is sprayable. Lots of colors available. Also UV stable without need of a top coat. My favorite aspect of Monstaliner is that is it so smooth compared to most liners. You could use a wash mitt on it.
Oh I've been out and about for sure! Mostly posting on Instagram these days, I need to get back on this forum. Too many media platforms, I need to cut back haha.
If you end up down in the PNW for whatever reason hit me up!
How's TMCO these days??