Thanks for the replies.
I may have been a little too gentle with my attempts at removal out of concern for cracking the tube.
Someone offered to sell me some unused spark plug tubes, so I think I will wait until I have them on hand and then try removing the leaking tube again. I'll try cleaning the transom plug as Pedro suggests and if that doesn't work, I will resort to pliers. The tube may already be cracked anyway, and it won't be a huge expense to install a new one.
After I replace the tube, I'll clean off the side of the engine and see if the leak recurs.
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2000 Arctic Silver/Black, Hard Top, On Board Computer
PNP Rear Speakers, HAES 6-Channel Amp, Avic Z140BH,
Painted Bumperettes, 2004 (OEM) Top, Homelink integrated in dash with Targa switch, 997 Shifter, Carrera Gauge Cluster with silver gauge faces, heated 997 adaptive sports seats, Litronics, silver console
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