While I cannot say how Mike does his, I will tell you how I do similar things.
First let me distinguish a few different names. There are true oops bands that are done to fix a problem, There are custom bands that are done on purpose, and then there are laminated or segmented blanks.
First the custom bands. They end up looking the same whether they are opps or on purpose but the method is different.
A planned band like these
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Are glued up as part of the blank. I currently cut mine on a band saw, but have also used a hand razor saw and a table saw. Unless I have a bobble (technical term) in the cut, I don't sand. I find that PU glue works good for all wood blanks, but I like CA for corian/wood combos. I cut the pieces, glue them up and clamp them. Than I drill them as one piece.
If it is an oops band to cover a blowout or something. I part off the damaged area on the lathe. Than I cut a section to replace it and drill it and square the ends. The glue it onto the brass tube that you just cleaned off and turn it to match the rest of the barrel.
for laminations and segmented blanks, there are 2 methods I have used. For laminations like this.
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I did it in steps. Cut the original maple blank in half. Then cut it diaginally and cut a slice of mahogany to glue in. glue and clamp the 2 halves back together with the contrasting wood in between. You have to use a clamp or jig of some sort to keep the halves from sliding length wise since they are cut on an angle. And use a clamp to put pressure to the sides.
I then took the resulting glue up and cut it diaginally again and put another pice in just like the first. On this on I also drilled and put a dowel in but that was a little over kill.
On a segmented blank like the top on here
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I took a half blank of oak and a half blank of mahogany and stacked them together and taped them with masking tape. I then drew the wedge shape I wanted and cut it on the band saw. Cutting with them stacked resulted in matching parts that I then swapped and glued together.
In this one I added a thin silver line in the "V". It is hard to see in the photo, but it is a silver plastic party plate that I cut strips out of and simple sandwiched between the "V" pieces.
This design requires only one clamp on the ends since the "V" shape hold everything in alignment while the glue dries.
Sorry this was so long and I hope it helps.