Another timing curve question

Mattax said

You know the spring perches can be rotated?
That might get the long spring in action another degree or two earlier.

Stock slots might work if you can get it to idle decently at the 22 or something like that.
Whats the stock plate stamped?

Click to expand...

I have not taken the entire mechanism apart past the weights and springs, but the spring posts on the plate end are round. Are they mounted eccentrically? I'd assumed they were permanently riveted or welded in place...

The T-shaped piece with the slots has "L13" stamped on the flat part and what looks vaguely like "13R" on the underside. Is that 13 dist degrees i.e. 26 crank degrees?