Double Tumbler - Jon Keegan

Double Tumbler by Jon Keegan.

The Double Tumbler is the second and more difficult iteration of the Tumbler puzzle. It has two additional parts. 
There are slots and indicating marks to aid in the puzzle experience.

"A different twist on a classic by Wil Strijbos"

Objectives:
1) Use indicating marks to find puzzle alignment.
2) Release tumblers into body of puzzle
3) Release double tumbler end cap

Twist, turn, shake, solve, learn. No external tools required. No force required. All movements are gravity-assisted.

Materials: mostly Alumin(i)um

This copy comes from the 1st owner. It has scratches on the outer surface from normal use.

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Please note:
I am currently auctioning 30 (mostly) metal puzzles on behalf of a puzzling friend who no longer collects puzzles.
The puzzle(s) will be sent from the Netherlands (Eindhoven), or delivered in person at an MPP or DCD or IPP.
Please pay via Wise(international) or IBAN(EU) or cash(at MPP/DCD/IPP), other options can be discussed.
Insured Shipping cost is €15 within EU or €35 outside EU.