I had Zimmerman's that cracked also on my race car. I swapped them out for the ATE units that have the two "Saturn" ring slots cut out of them. They work very well without any problems.
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Chad Plavan
911ST Race Car/2.5L SS Race Motor #02
1972 911T- Numbers matching- Restoring to stock
2011 Porsche Spyder Wht/Blk/Carbon Fiber Buckets/6-Speed (Sold)
2016 Elan NP01 Prototype racecar- Chassis #20, #02
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