Insert a screwdriver into the plunger from above and loosen the holding screw by 3 to 4 turns. Insert the Blade:
Even with the official "i--- manual" (illustrations/schematics), users face practical issues. Here are solutions based on the PST 54 PE’s design.
Press the trigger (a) and the lock-on button (b) simultaneously, then release the trigger. To stop, press and release the trigger again. Stroke Rate Control: