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Here's a tip: Put some industrial velcro on the bottom of your battery tray and battery. This will keep your batt from shifting forward on hard impacts preventing both the batt and tray from being damaged.

Superglue and heat shrink are a good combo fix for CV pins.

A little bit of slop in the front end is good for handling on rough tracks. Obviously you don't want too much, but if you get it to were there is none the car will get very twitchy in the rough.