Note that the screw has two different size threaded ends and only one nut. The nut will fit pefectly onto the smaller screw, yet the performer does the impossble and threads it onto either end. Surely that is impossible?
Precison made in brass. Complete with detailed instructions.
No skill required, it can be repeated immediately.
The item is made of brass, everything can be examined.
When the nut is screwed on one of the two ends, the bolt is 4.5cm long and 1 cm in diameter.