I know that Park Tool has their own crank removal tool but, WHAT IF you want to make your own??
Step 1: Materials & Tools
•1.375 inch x 1" Dia 6061 aluminum solid round
•.125 inch x .5 Dia 1045 mild steel solid round
•2 inch x 5/16 - 18 Grade 8 bolt
•Metal lathe (thread cutting ability)
•Round End mill - (5/8)
Step 2: Machining!
•Place the stock Al in the lathe and face off both sides of the piece with a facing tool.
•Turn down .75 inches to .8661 (22mm)
•Drill and tap a 5/16 x 18 inch hole .5-.75 inches from "necked down" end.
•Cut "wrenching" flats
Step 3: Threading!
•Set up your machine for 1mm threads. The Major diameter is 22mm or .8661 inches. Thread for about .375-.5 inches .
Step 4: Filing!
Step 5: Machining the Plug
•It needs to be .5" x .125" with a "dish" cut using a ball end mill.
Step 6: Using It!
•NOW, just place the plug into the crank bolt hole (dish out), then screw in the remover tool, and use a 3/4 wrench to tighten it down, then use a 1/2 ratchet to push/pull the crank off!
Also check out my MONSTER chain instructable!
P.S. Please vote for me for the Bike Contest!! (if you are so incline)