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Pro-Body Tool

Who Moved My Wheels?

In some Pinewood Derby races, extended wheel bases are allowed, and if so in your race, you had better enlist this speed tip or choose to just be competitive.  Extending the wheel base is basically moving the axle slots further towards the front and rear of the car as shown in figure 1.  

(Note:  We have marked the new axle holes on the same side of the block as the regular axle slots to show the difference in locations.  In marking and drilling the new holes, it is best to use the opposite side of the block.)

 Figure 1

New Axle Holes for Extended Wheel Base

 The rear axle slots are moved back just short of the maximum distance one can without surpassing the 7" length requirement of the car.  The front axle slots are pushed well forward of their location out of the box but are located just a little further from the end of the car than the rear axles to alleviate any risk of the axles being damaged or misaligned in the race.  After all, even with foam padding at the end of the track, there is a fairly abrupt stop.

The Pro-Body Tool as shown in figure 2 is designed to use a # 44 drill bit (included with the Pro-Body Tool) and will help align the bit with a hand held drill. 


Figure 2

Pro-Body Tool Used for Drilling  Extended Wheel Base

The rear axle slot needs to be drilled no closer than 5/8" from the rear of the car and 1/8" from the bottom of the car.  Otherwise, the car will exceed the maximum length of 7".  The front axle slots need to be drilled no closer than ¾" from the front of the car and 1/8" from the bottom of the car.  The dimensions for the new axle holes are shown in figure 3.

Figure 3

New Axle Hole Locations for Extended Wheel Base

To use the Pro-Body Tool:

  1. Test fit the Pro-Body Tool on the bottom of the block with the two ‘ears’ positioned on the sides of the block.  If the tool will not fit onto the block, use coarse grit sandpaper to reduce the width of the block until the tool fits snugly.  If the tool is loose, tighten the fit by placing a piece of paper, folded as needed, between one ‘ear’ of the tool and block.
  1. Measure and mark the desired position of the new axle holes on one side of the block as shown in figure 4  (5/8” from the rear and ¾” from the front end as stated above).



Figure 4

Rear Axle Hole 5/8” from Rear of Car

  1.   Extend the mark from the bottom of the block to the top of the block using a square rule as shown in figure 5 or make a similar measurement at the top of the block and use a straight edge to join the marks.


Figure 5

New Axle Holes 1/8” from Car Bottom

  1. Position the tool on the bottom of the car with the two ‘ears’ on the sides of the block and align the index mark with the line on the block as shown in figure 6.


Figure 6

Marking Line for Pro-Body Tool Location

  1. Hold the block firmly (use a clamp if available), position the drill bit in the hole, and slowly drill ¾” into the block as shown in figure 7.

Figure 7

Drilling New Holes Using Pro-Body Tool

  1. Without releasing the clamp, turn the tool and block over, and drill the second hole.
  1. Repeat steps 3-5 for the other 2 holes.  

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