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Re: Weird Chain tensioner.
For at least the last 4 years, we have used various sizes of delrin rods (COTS spacers work too) riding on bolts (in slots or in fixed holes) for chain tensioning on the drivetrain and other mechanisms. This allows for easy adjustment (change OD of delrin) as well as making maintenance easier (remove the bolt and the chain is instantly slack, sometimes so much that you never have to break it).
As for having no tensioners, IMHO it is a pain to get the chain the exact right length and get the master link in, so fast replacements when you lose the chain during eliminations are difficult at best.
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2010 Newton Division & Championship Winner w/ 67 & 294
2009 CMP Champion - Newton Division
2008 CMP Champion - Archimedes Division
2007 Newton Division & Championship Winner
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