@mijostyn and @dover
I get the mass is mass - likewise I also get the issue with reviewers - many a culprit there - too many to mention - a lot of Emperors New Clothes.
The Derrenger (at least i think that's the name) does a very sophisticated 'active' lateral movement - that makes sense.
The old B and O has a hybrid mechanical lateral insofar as it pivots and upon getting to a point shuffles along actively. remember - it had a very light arm and was properly thought out - in fact i liked thee engineering approach of thinking out of the box - shame there is no affordable modern alternative that can be fitted to other decks.

