Michael Henriksen from Harpenden (UK) worked on a kit that assembles into a small stair type ball lifter. Ready-to-run models are also being worked on and will be available later this year.
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The Kit is now available on Michael Henriksens shop „Busted Bricks“ and has wooden tracks for those who don’t like welding.
http://www.bustedbricks.com/marble-machine-kit-1-146-p.asp
And here a video:
http://www.youtube.com/watch?v=RqaHs_NL01I