Strip down I posted a few weeks ago
Credit to Gary at Celtic vapes
Step 1: unscrew 510 connector and remove plastic washer
Step 2: ease off fire button and remove spring ,take note which way spring is sitting, you may need screwdriver either side of fire button to remove ,the little grey pin on the fire button is part of the lockable button feature
Step 3: take needle nose pliers and gently pull on fire button pin that is in control head to remove plastic housing
Step 4: take needle nose pliers and gently work out centre post and spring from bottom of control head
Step 5: lay control head with top side flat on surface and insert screwdriver into hole on base of control unit and gently tap remaining centre post out
Step 6: turn control head over so top can be seen and take a flat headed screw and gently tap out remaining plastic housing
Step 7: rebuilding of control head is reversal of what has just been done Tip: build fire button assembly before refitting ,makes it easier to get fire button on fully and line up grey pin on fire button so that it is in the on position ,you will see the groove in plastic housing