Butterfly box - Strijbos

Butterfly box, a.k.a. Pleasure and Pain, by Wil Strijbos.

A famous puzzle (box? lock?) that has brought pleasure and/or pain to many puzzlers.

Instructions:

Turn the black "lock" tube straight up and then put EVERYTHING back EXACTLY in the start position. 

Please don't use any force - when you feel friction, stop!

Just turn things over, slide things back and forth carefully, change positions etc.

No Banging, No Rotational Moves, No Force Required at all! 

This copy comes from the 1st owner, and comes in its original box. It has minor 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.
Please pay via Wise(international) or IBAN(EU) or cash(at MPP/DCD), other options can be discussed.
Insured Shipping cost is €30 within EU or €50 outside EU.