Double Colour Prediction (Metal) by Sorcier Magic

Simply a baffling prediction that will fool anyone.

A small playing card-sized metal plaque is shown to the audience. Three holes are made on it corresponding to three different colours, yellow, green, red. A spectator is now invited to take two bolts and two nuts and fix them into two holes, the third hole remaining free.

Attention is drawn to an envelope left on the table all the time. It is a giant plaque (approximately 25cm x 16cm) corresponding to the plaque delivered to the public.

In fact, once the plaque is removed from the envelope, the public can notice that the latter contains two bolts fixed in the two holes corresponding to those chosen by the public! The envelope is empty and the magician can unscrew a bolt or two to prove that they are authentic. Provide the two metal plates, a question mark to apply to an envelope and all the bolts to perform the effect.

Easy to do, you will demonstrate your divination skills.

Envelope not included, video instructions attached.