Greg,
You would be impressed... I had the cahnce to look over a used head opff a 79 300D just for planning purposes on this projeect and guess what. Two of the prechambers are burnt all the way through on the tips.
Hmmmm, think that could be a problem on my 300????
I'm gonna build that tool to pull them this weekend and see.

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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