OK, I gently scraped the sides of the lever inside and out with my little awl, and eventually took my courage in both hands and pushed at the pin ends, whereupon they fell out.

Now it was simply (!?!) a matter of finding a suitable pin, (which turned out to be the end of a Ronson Lighter Service kit's wick installer), and cutting it to length.

Then you try a re-assemble it and discover that if you place the bar in the "obvious" manner, i.e. with the cut off in the bar facing down, you can't get the re-sacced section in, as the end of the bar is too far down. (How you'd ever get it out again, I don't know ((yes I do--- you just rotate the lever again....)).
Re sac as usual, and whilst you're waiting for the shellac to dry, visit your local road-blockers emporium and acquire some genuine talc, (as it stops your work smelling of babies).....put it all back together and test it.