I m new to fishing and I ve got fat fingers so I copied this invention.
There are 2 version, one with the iron wire and one with magnet.
 

Magnets are 2mm height x 6mm diameter

Bolts are M3x20 and M4x20
Nuts are M3 and M4
 

Redrill the holes, upper holes with a 5mm drill bit and the other under the clamp with a 6mm one.

It's really simple to mount so enjoy and be careful.

Now you have to turn the tool how many times you want, be careful that the exceeding wire wraps correctly and upwards.

Now you have to pass the exceeding wire behind the first button and you can press the second button to free the loop

Now you have to pull the tool towards yourself and be careful that the loop does not enter the first button

At this point you will notice that the loop will wrap perfectly around the hook. Pull harder to make a tight knot.

Now you can release the hook and pull the exceeding wire and the knot is done.
 

Make sure you hit the like button, sorry for the language that is not mine. Hope you understand.
 

Cheers.

Ps Soon I will release the version 2