Note: Exact placement will vary depending on the length of your chain. Be sure to test the angle of your derailleur to make sure it doesn't interfere with your gear on the roller. Once positioned, test the angles of your derailleur to make sure it fully extends.
A piece of wood (Photo credit Karen Stufkosky)
Get a piece of wood that fits behind the bike stand without interfering with the roller.
Optional: cut out center (Photo credit Karen Stufkosky)
Optional: Cut a wedge out of the base of the board to allow for easier access to the height adjusting knob.
Screw block of wood to the wood base (Photo credit Karen Stufkosky)
Screw a block of wood to the wood base, if you chose to cut out a piece in step 2, this piece of wood will do.
Motor screwed to block of wood (Photo credit Karen Stufkosky)
Screw motor to the piece of wood you attached in step 3, make sure the motor is aligned to the roller or you will loose power due to the excess resistance caused by the un-aligned chain.
Chain attached to roller (Photo credit Karen Stufkosky)
Now weave your chain onto the roller and motor sprockets.
Sprocket used as stabilizer (Photo credit Karen Stufkosky)
Take the sprocket that you cut from the bike pedal, grind off a few teeth perpendicular to one of the 5 holes, and screw it into the bike pedal
Test angle of derailleur (Photo credit Karen Stufkosky)
Test angle of derailleur mount to ensure the clearance of the roller when its adjusted.
Adjusting the pedal (Photo credit Karen Stufkosky)
Decide on a spot to mount the pedal and screw it into place with metal brackets.
Sprocket mounted (Photo by Karen Stufkosky)
Now that the pedal is mounted, slide a 1x2x5 inch piece of wood into the gab between the sprocket and the pedal. Screw it into place using at least 2 of the four remaining holes.
Cut plexi-glass pieces to fit around the wooden base.
Plexi-glass (Photo credit Karen Stufkosky)
Glue plexi-glass pieces together with plexi-glass solvent to join the pieces, making a box.
Attach Hinges(Photo credit Karen Stufkosky)
The box must be opened periodically to maintain moving parts and tighten bolts. A hinged door makes this possible on the long side of the box next to the motor. Hinges are bolted to the top of the box and to a side piece of plexi-glass.
Attach magnets (Photo credit Karen Stufkosky)
Affix magnet plates to bottom of door with screws. Screw magnets onto main wooden board.