Superchuck
It is the pushrod your talking about. You just have to take off the tank and rocker box to get to that. You may even be able to see down the hole to determine whether or not it's bent with out actually taking it out.
The easiest way to remember the difference is tappets, si they are also known as cam followers or lifters. They run directly on the cam, and on the UCEs, are replaced by the hydraulic lifters. They both still use pushrods, so are known as pushrod engines, as opposed to Overhead Cam engines, that have the cams in the head and run the valves directly, or in some cases just have the rocker arms. These are made to dispense with the reciprocating weight of the pushrods and tappets and allow higher engine speeds without valve float. Not a great concern on a Bullet.
This treatise could go on forever...I quit!
As for your original question of about how to bend one, I know of only two ways, overrevving, or a sticky valve. The only way I know of to overrev an Enfield is to grab full throttle as you are sitting still in neutral, or miss a shift at full throttle. As far as sticky vlaves go, that's a little tougher one to call, but it can be caused from overheated oil and coke on the exhaust side. It's hard to check for unless it's still stuck, in which case you wouldn't be riding it. Has your bike ever started missing while it was going down the road, then smoothing out again? Could be an indication.
Anyway good luck on your quest.
Bare