They may, Rick, but it's not always needed today. My mom has some metal in her and it's not a problem. Glen does have 90% more, so maybe he will. 
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Make sure to check out my balls in the Pelican Parts Catalog! 917 inspired shift knobs.
'84 Targa - Arena Red - AX #104
'07 Toyota Camry Hybrid - Yes, I'm that guy...
'01 Toyota Corolla - Urban Camouflage - SOLD
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