A stove element is all or nothing, the ni chrome wire is inside the tube. The cloths dryer or similar element is open, and You can use as much or as little by bolting the cables to it with a machine screw, nut and washers. The transformer and rectifier are seperate components, look for cooling fins or aluminum plates in the cooling air flow to find the rectifier.
As for the bypass cap, have the guy pull up the Ranger 9 PDF and lok at page 34. It may be part of K799 High-Freq Kit, I would expect it to be available as a replacement part, or for use with other brand Hi-Freq boxes. Look at Lincoln part #T 12246 and T 11577-52A. And You had better do something about that fork stuck in Your forhead.