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Can you have them x-rayed for cracks?
A little wear on them should not necessitate trashing them.
If it is just cosmetic then I see no problem in using them. Could a Porsche dealer/shop verify thier condition?
Trust me I am not trying to kill anybody using worn out parts. Ceramics are just a different animal.
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Adrian Pillow
'57 Oval Beetle - project
'66 VW Westfalia - GL
'96 GMC Sierra Crew Cab 6.5L Diesel
'99 GMC Suburban 6.5L Diesel
VolkSport Kafer Gruppe
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