[aa-jv]

>I've never seen any evidence that the Simple Sabotage Field Manual is actually effective as opposed to just propaganda and an effort to try something.

Citroen's trucks were sabotaged in occupied France .. workers were instructed to move the line on the oil-level dipstick about 8mm lower, resulting in the trucks being operational for about 100km's and then freezing up enroute ..

The French Resistance applied its techniques effectively, also.

One could say that the Stuxnet attack on Iran's centrifuge facilities followed the same playbook - introducing subtle, undetectable errors over a period of time which eventually resulted in the destruction of the centrifuges.

There are examples. You probably do have to go looking for them though - thats the nature of covert subterfuge, after all ..