zplinker, thanks for the advice. I'm using shim washers to time it. No lathe here.
I had to use a "short", 4", brass bar to get it timed. It's perfectly level with the horizontal line of the scope. It's not extremely tight but tight enough I couldn't brake it loose by holding the barrel with my hand. Next time I'll bring a pipe wrench with me.
Edit to add, I re-shimed it. It's now "hand tight", timed and location marked so I csn return it to same position.