"Long time ago (it was in 1979) I visited London for the first time. I discovered many new puzzles there. Many of the nice wooden puzzles I saw there were produced by a puzzle company called Pentangle. I wrote a letter to Pentangle and I received an invitation from Mr. James Dalgety. He was not only one of the directors but also an enthusiastic puzzle collector. James invited me to come over and see his collection, and nearly one year later, in 1980, we met each other at his house.
For this occasion I was inspired to create a puzzle. I came up with the idea for this “Cross Puzzle”. It was the first puzzle I ever invented, and it was a start for me to create many more puzzles later on.
About the Cross Puzzle: At that time I have never seen any kind of this puzzles before. It is my own original idea, the only inspiration was my visit to James. The solution has nothing to do with rotational parts and there are no magnets inside. There is no force required, just use the spring power inside the Aluminium Cross Puzzle." -Wil Strijbos