So, how are these wedges placed in their respective hole? Does one have to place it so the "split" follows the desired line? Alignment/mechanism?

Yes. Figure out how you want the split to run and then place your wedges so it splits the rock in that direction as the wedges push apart the feathers. Two things I learned: Make your holes 5/8", not 3/4". I tried 3/4" holes and it didn't work as well. Also make sure you drill your holes deep enough. It's a bummer if your wedges bottom out in the hole before the split begins. Other than that, it's amazing ancient technology at work.

How deep of a hole do you drill? The description says 1.5” but this seems very shallow considering the shim is 4.5” long.

The shoulders of the outer shims sit near the top of the hole and there has to be room for the wedge to go right through without bottoming out. Looking at the dimensions in the diagram about 4" minimum depth. If the wedge does hit the bottom it can be extracted by drilling a second hole alongside but it's best to avoid that. The description also says a hole 0.5" diameter and that's wrong too.

Brand	Abuff
Manufacturer	abuff
Model Name	Language _ tag
Package Dimensions	16.6 x 11 x 5.6 cm; 1.39 Kilograms
Special Features	Lightweight
Power Source	Hand powered
Batteries Included	No
Batteries Required	No
Material	Metal
Manufacturer	abuff
Item Weight	1 kg 390 g

Abuff10 Packs of Heavy Duty Wedge and Feather Shims, Abuff 5/8 Inch Plug Shim and Wedge Concrete Rock Stone Splitter Hand Tools

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