Someone once mentioned that the master link for a gasser chain fits loose enough to use as a temporary link while rolling in the new chain. Then you can remove it easily and use the peened link to finish teh job.

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'99 S420 - Mommies
'72 280SE 4.5 - looking to breathe life into it
'84 300SD Grey - Sold
'85 300SD Silver - Sold
'78 Ski Nautique