Good idea, Silver Hilton, but don't try to use a Hole saw. A hole saw either needs a guide bit or a drill press to hold it. If you have a Forstner bit and a slow drill, you might try that, but it might be a wrist snapper. A tapered Uni-bit with a maximum diameter of 1" would get you there the safest.
My old Alumadrifter had 3/4" plugs in it. Try Fishermans Marine and Outdoors or Stevens Marine.
I had one of those emergencies once where the only store open was GI Joes. As usual, they didn't have what I needed so I bought some 1/2" plugs and a roll of electrical tape and built
the 1/2 inchers up with the electrical tape. I think I ended up using those same plugs for about a year and 1/2 before I finally decided to replace them with the proper ones. Worked Fine.
If nothing else call Clackacraft. If they drilled the hole, they should have the plug.
As a last resort, you could always try a wine bottle cork. :grin: