I know this is going to be tough for you, given your obvious problems with grammar and sentence construction, but try.
My previous post used what is called, in literary terms, an analogy. An analogy is a way of saying something is like something else to make a point. I can see that either that was lost on your understanding or, you purposely wanted to belittle my analogy in an attempt to belittle me. Either way, let's pick it apart to show that it meets the definition of an analogy.
A double gun is not like a corn head in any way, except the importance for proper care and lubrication. The lubrication part is where you got lost in the weeds, apparently. Certain places on a double gun need different types of lube to meet the needs in an ideal way. A corn head is the same, thus the analogy.
Read this through a few times and I'm sure a little light bulb will come on. Unless, your post was totally written in meanness and you really DO understand analogies. Makes no real difference to me.
'Bye now.