Main Motorcycle: my 1995 Triumph Tiger
Join Date: Aug 2007
Location: Southern Adirondacks NY
Other Motorcycle: 1999 Triumph Legend
You need a thin wall socket for the plugs. I had a machinist turn a regular one down, or you can buy one from a tool company. Snap On or Matco will have one, but it will not be cheap. Others have found an inexpensive alternative in some of the cheaper models from hardware stores. Someone may chime in, or you can use the search button.
I use a long handled 3/8 drive ratchet with a short extension to remove mine. Drop the socket on the plug, then push the extension into the socket, then attach the ratchet to the extension. Remove in reverse order, and use one of those small telescopic magnets that look like a radio antenna to retrieve the sock and plug. Installation goes easiest with a short piece of heater hose over the ceramic of the plug, turning it counterclockwise until you feel the "click", and then clockwise to thread in. Once the plug gets tight, the hose will begin slipping on the ceramic, and then you know it is time to use the torque wrench. I also use just a tiny bit of Never Seize on the threads of the plugs, being careful not to get it near the electrode. Applying some and then wiping it with a rag to spread it evenly seems to work for me. Since you probably won't be able to get the torque wrench into the middle plug, use your ratchet to feel the already torqued plug, and then find this same tension on the middle one. Also, it is worth the time to pull all of the coils off to give yourself as much room as possible.
Some trip knobs had tiny screws holding them on, and some were a snug friction fit. Use a light to see if there is a screw in yours. If not, just use a small pry bar with a notch to gently pry it off.