I suggest calling 1-800-879-8000 or going to the Hilti.com website and downloading a schematic for this tool. Let me know if you need more help
When you take the cocking lever and go foward with it to advance the booster strips you will notice that it is connected to a lever on top of the tool housing. With the cocking lever foward you put your finger on the lever on the housing holding it foward. Come back slightly with the cocking lever will release it. Then you can unscrew the front baseplate and remove the front guide, piston and piston guide. I would not suggest you go any further than that.
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