You can get the wrench at any Home Depot or Lowe's. They are a standard wrench for plumbing and will be in plumbing section. Any hardware store should have them also. My packing glands are so tight I couldn't budge them with the short handles on these wrenches...guess I will need a cheater bar.
I've got to change my packing soon also. Not sure if I'm brave enough to do it in the water

may have the marina put it in a sling just incase. If I at least hook up a backup bilge pump I guess I would take the chance in the water.
Good luck my friend...let us know the outcome.

1985 Marinette 29 Sedan bridge
Twin 318s, 660 hours
New Edelbrock 1409 carbs (working like a charm)
Original Electronic Ignition, Blaster 2 coils, 90 deg plug wire universal kit cut to fit
Raw water system
Freshwater always
Located Pickwick Lake, TN,MS,AL
RETRO BOATS ARE COOL
If the guys on this forum take their time to help you, have the courtesy to update your thread with the resolution.