vortex warning...
seen these a couple years ago, people are still dumb enough to buy it<ul><li><a href="http://cgi.ebay.com/ebaymotors/UNIVERSAL-7-WIRE-CENTRAL-RED-GROUND-GROUNDING-CABLE-KIT_W0QQcmdZViewItemQQcategoryZ33574QQihZ008QQitem Z180196440300QQrdZ1QQsspagenameZWDVW">NOT MINE!!! SO DONT DELETE PLEASE</a></li></ul>
The bolts holding the turbine housing onto my holset had similar pieces to keep them from backing out. It works awesome.
those things basically require the bolt/nut to back out to work. (if there is any gap or give, forget it) vibration and thermal expansion alone will take care of that.
maybe those things will prevent a nut from completely unwinding, but from a functional point of view, once the bolt preload is lost its game over.
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