Hey, Merry Late Christmas! Welcome, John, and congrats on the new machine!

You may want to call Duncan or PM him on this forum, if only to ask about the manual. You have the updated version of the 210EXT, and the manual on the Everlast download page is for the earlier machine and it looks like the functions are different. I'm a little surprised the manual was not in the box. You could ask him about the electrode holder since you're on the line anyway.

The 210 is similar to the 255; the 255 ships with an air cooled torch and a water cooled torch. At first I thought you received the accessory package for the 255 but the wp9 and the wp26 are both air cooled. I don't know if the newer 210 ships with two air cooled torches or not. No harm in contacting Duncan to follow up with questions.