I'm trying to disassemble the sliding actuator version of SiTech's drysuit inflator as it's leaking and I want to access the o-rings to clean/replace them. I have it disassembled to the following stage:

I peeled off the label, but unlike the button version the sliding version does not have an allen screw hidden beneath it. I'm not finding other screws so am stuck at this stage. Any pointers to further disassemble the inflator housing would be appreciated.

I peeled off the label, but unlike the button version the sliding version does not have an allen screw hidden beneath it. I'm not finding other screws so am stuck at this stage. Any pointers to further disassemble the inflator housing would be appreciated.