Here is a picture of the K4. The adjustment for different thickness stock is accomplished with a nut and threaded rod to get you close. (red arrow).
The red circle shows the arm to finish tightening the clamp and holding the stock in place.
Here is where the biggest difference is. The holes are drilled from the opposite side of where the clamp is.
When you are using small stock, it should not be a huge pain to deal with.
If on the other hand, you are drilling holes in a 2' x 6' piece of 3/4" plywood, now it becomes an issue to unclamp, move the piece, and reclamp, then go to the other side to drill the hole.
I say that, not based on my experience, but watching reviews of others, who brought that situation up. After looking at that, I decided to have both the final clamping and the drilling on the same side.
If on the other hand you don't use larger pieces of wood, it should not matter.
One more item. I saw one person with a K4, who removed the original clamp system like is shown here, and mounted an air cylinder in it's place.
He then mounted a foot switch on the floor, which controlled the air cylinder and clamped and unclamped the stock. It made that portion of the operation quick and easy.
If the jig is always mounted on a bench and never moved, that seems like a good idea.
Yup, another long winded answer to a simple question! Lol...
