In theory that is quite correct and valid. But when you have to put the action in a mill to apply enough down pressure with the quill to be able to break the strickers loose, isn't all that easy. So far I have worked on a Citori that wouldn't budge, and as the pins were ok we didn't destroy the bushings. A Spanish gun we had to put in the mill. An AYA and a Webley that required making tools with square shank screw drivers to use a wrench to break them loose. Forgot the Uggie, that only required making a tool.