As far as I'm aware, you're right about there not being a specific stopping mechanism Jamie. When I've tested Neophyte in the past with the locking bar in the actuator has simply stopped, which I presumed was what was supposed to happen when the actuator couldn't move. After the test the actuator has always worked perfectly fine (although at 200N it is a relatively low powered actuator). All this is just my personal experience with my actuator, if you or anyone else knows something I don't or has their own experiences by all means let me know, thanks.