I came up with the idea because some good American fishinglures are to big or to heavy to fish with in the Netherlands When fishing on Dutch Pike.
The water is often very small and shallow.
Press the lure half in the clay and make the clay as smooth as possible.
It's important that the clay is pressed around the lure and leave no spaces.
Make a couple of holes of 1/4 inch. This make it easier to match the two parts of the mold later on.
For example, you can do this with the back of a pencil.
Hold the planks together with some elastic bands.
Make sure that you pour it gently because you don't want to much airbubbles.
It's best that you pour about a 1/2 inch above the lure so the mold is firmly.
Remove al the clay from the lure and silicon, but leave the lure in the silicon, this very important.
Turn around the silicon mold with the lure in it and put back the wooden planks.
Spray with some special silicon releaser and pour the second half of the mold.
Now you can remove the lure and make with a sharp knive a pouring hole.