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Old 03-24-2006, 06:19 AM
  #14026  
AdrianM
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For guys that crash more than they would like to turning a diff into a spool is a great alternative.

Tightening a diff full tight is not enough. If you really tighten it you could pop the thrust bearing circlip out, damage it groove and ruin an out drive.

To make a diff into a spool:

1. Disassemble a diff but leave the thrust bearing in the female out drive alone.

2. Remove the diff balls and clean all the silicone diff lube from the pulley, diff rings and out drive faces.

3. With thin CA glue header card stock to one side of the diff rings. Cut them out so that one side of the ring is faced with paper.

4. Reassemble the diff with no diff balls and the paper side of the diff rings facing towards the pulley. The paper takes up the space normally occupied by the diff rings so the width of the spool is correct.

5. Adjust the Spool/Diff just like a diff. Full tight then back off 1/4 turn. This will allow the spool to slip and dissipate energy during crashes. It will NEVER slip while racing, only during crashes.

The only disadvantage to the spool/diff is that it is heavier than the kit alloy spool. You will have to judge for your self what is best for you. For club races I run a spool/diff as blades will last forever and the out drive will never spread no matter how hard you crash (if the spool diff is back off 1/4 turn on the adjustment screw).
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