Good questions - it forced me to clean the planes up after last weekend and get my head back into what was going on.
Both of mine were made in the US - I will post pics of the boxes here to show where they came from.
The oldie had 2x the throw, but not to the limits set by the void in the vert stabilizer/rudder. See pic - I shot it so you can see how close it comes in the up position to the void in the vert fin.
The bellcrank maxed out before anything else - interference from the edge of the access void for the bellcrank, in the fuse.
The difference was that my newbie had the pushrod way on the end of a longer control horn, compared with the oldie.
There is a hole halfway to the pivot point for more extreme throws.
You can see in the pics that neither stabilator was limited at the back end - it was at the bellcrank.
The control arm of the oldie was 1/2 the length of that of the newbie, with only one hole as an option.
So, it's in which hole on the stabilator control arm that the pushrod is set, that sets the throws.
I just picked up 1 and 1/2 more PT-19s and will get them out and take a look if they are of any different vintage than the ones we have.
Cheers - Peter