I've been using the custom "hockey puck" style for years without any issues and to answer your question, the groove in the center of the adapter is deep enough so the pinch weld does not touch the bottom of the groove. And yes, the area surrounding the is being supported by the FACE of the puck (or adapter)...
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mults
40th Anniversary 'Z', 312.06HP/260.58TQ (Dynosty EcuTek Tune)
Build Date/Number: 1/27/2010 #706
Berk HFC + CBE, R2C CAI, Clear Bra, Cleveland Z Club
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