Yari
Master Black Belt
Kinda hard to do the topic justice via a forum but I'll give it a go.
I agree...
When doing the lock in a three dimensional circular motion the knees of uke, particularly the knee on the same side as the wrist being locked, comes forward and down very harshly.
When I try and visualise this i get the picture that your "pushing" the fingers into his arm.
/Yari