Regular servicing on the internal mechanism is fine; just don't oil the SST mechanism.
That's not my recommendation; I don't own a Parker single trigger and have no way to personally know. I'm passing on what has been said here for many years by people with experience with the Parker single trigger.
The problem with turning screws in a Parker is not the turning, it is the butchering and buggering the screw slots, and then putting the screws back in the wrong holes, and then beating down the floor plate because its hard to fit back correctly, etc, etc. Done by an expert or somebody who has skill , patience and the right tools, no problem. You look at Parkers on these internet sales sites and you see many examples of the old saying that more Parkers have been harmed by people messing with them than by any other reason.
Somebody turned the screws on this one:
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Threaded Mode