You're thinking of Waste Not.
I personally don't use WN much at all. If you use it properly it effectively buys you 20 durability for 56 CP, which is more efficient than Manipulation but less than MMII. The big downside is that you have to use all the steps doing things that hit durability or it loses effectiveness, which means you lose value if you get a Tricks proc. That's likely less of an issue these days now that Precise Touch exists, so it could be worth testing on 35/40 durability mat rotations early on in the sequence.