We don't disagree, you simply misunderstood. The idler you pictured, there, is a "properly made" one.
The one I came across does NOT have the extended sleeve for the bolt to go through. On the one I have, If you start shimming it with washers, it starts to tighten up and cause friction in the what should be bearing in the K end, and worse, if you "don't" you have slop.
My concern, therefore, is that the OP "had" one of these 3rd world designs, LOL
(I'll try to dig this marvel of engineering out, a truely P.o.S if I ever saw one!!!)