You will need:
one slr lens to dismantle, mine was one that had a broken focusing mechanism, but you can get the same part needed from nearly any lens, get cheap one from a second hand sale/flea market for peanuts
blu-tac, to fix the macrogyver onto the front of your normal lens.
set of mini screwdrivers to dismantle the lens.
Step 1: Step 1
Step 2: Step 2
the element you'll need is the rear one, this may be different with other lenses so just try each element by holding it manually in front of your camera and checking.
it will basically look like it has a small lens on the front with a larger lens on the rear.
Step 3: Step 3
Make sure its level and not crooked.