Defently want to use the pennies or the IRS (shameless plug, even though I dont run the car or run for them, lol ) scales which should set you back quite a little (on the other hand two pennies will cost you... two pennies ). The tweak boards are designed for sedans and really arent sensative enough to provide you with precise enough tweak measurements. Also its very important, make sure the surface you are tweaking on is level. you can use the level from a buddies tweak board, or go buy a level at a hardware store to judge to see if the surface is perfectly horizontal. If you need to adjust your board, your buddy Abe will come in handy again... just place him or one of his other metallically immortalized friends in a corner of the board to raise it to make the rest level.

Also the plastic peice, I think, think (so dont quote) is an AE piece that is used to hold the t-bar in place.