Cheap fix : once did a field mod when i noticed the front wheels whobbling on a high grip track. I simply pulled a tie wrap around the servo saver. It made it a lot stiffer and worked so well I've used this field mod as a permanent fix.
A long time ago, I couldn't get my 1/12th pan car trimmed. I quickly noticed the servo never got back to the same neutral point (I was using a Kimbrough saver). It turned out to be a bad/worn potentiometer inside the servo. Mini Futaba analog servo's and all analog Hitec servo's were ntorious for this potentiometer fault. I don't know if digital servo's still use a potmeter to determine their postion, but it could be worthwhile to put your car on the track with the body off (you have to load the front wheels) an check if the servo itself always goes to the same neutral point.
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