Yep-you got it! there is also a "push stop" under the mag front corner that you cant see--it contacts the bottom of the bulkhead floor to keep the mag front corner of the plate from diving down when you nail the throttle-IMO, that violent movement was a big part of the infamous "broken mag engine bolt" that many experienced early on(along with the other design issues that we have all beaten to death).
Mark, I wish we could eliminate that buzz...these are definitely not silky smoth engines!