humbled valiant wrote:
My 66M block arrived and I discovered clip 1 = clip 2 | clip 3 = clip 4 of
row 1, where "=" means electrically connected and "|" means electrically
isolated, on row 1. Similarly, row 1 | row 2 | row 3, . . . | row 50. That
means that on row 1, column 1 = column 2 | column 3 = column.

yup, the standard M or split M block.

My $15 punch down tool arrived but the 66 blade only punches down and cuts.
I can do all the cutting, grind the blade off and do all of the weaving.

Any chance the blade flips over for the non-cutting side? Now that you can see the profile of the
tool you may be able to fake with it with something else for the the uncut connections. The impact
feature (if your tool has it) isn't needed except for cutting the wires. Maybe wrap the busines end
with cut up pop can to hide the cutting part so you don't need to grind the tool.

Since I only need to join 2 cables at 6 pairs to 6 pairs in each of 3
locations, I only need 36 rows, I can use my bandsaw and cut 12 rows each,
leaving the last 14 rows to join 4 cables at 6 pairs each using bridge
clips.

It doesn't look like I need to strip the wires on this block, since the
clips taper down towards the foot.

correct. never strip the wire first, but you should be using the proper guage solid wire for these
blocks. They're quite tolerant, take a range of wire and are quite reliable like everything the old
AT&T came up with.