Hey there,
here is my bump map setup with the saw marks and the jitter for the Procedural Wood - Saw Marks Lecture. Im not a fan of daisy chaining bump maps as this approach allows for individual control of the jitter and saw marks bump. In other words with my setup I can have saw marks but no jitter bump if I want and vice versa. I tried going for a maximum node at the end here so the sequence of bump maps dont add up too much.
Here is my bump map
Here is the result
Here is my complete node graph so far
Cheers,
Kevin