I'm not a big fan of the Articulated mechanism, although I know many people that prefer it over the added tonehole version. If the new tonehole is done right it can sound the same as the standard Bb fingering.
Puchner does a version of this on their 6000 series instruments where the tonehole is much larger and opens only the new hole, instead of having the lever open the regular Bb pad and the new hole together as is most common. On my bassoon you may remember I had the more usual method retrofitted to be automatic and combined with the regular Bb key:
https://tjbassoon.com/2014/07/20/an-aut … -retrofit/
Don't take this to someone that doesn't really know exactly how to do it all. Aren't you a Fox player Josh? The best thing is to have them install the mechanism. It's going to be the cheapest and most competent job since they have all the measurements and pieces ready to go.
M.M.A., D.M.A. University of Illinois at Urbana/Champaign: B.Mus. Lawrence University
Bassoon professor at University of Wisconsin Eau-Claire
Maker of the Little-Jake electric bassoon pickup and Weasel bassoon reeds