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For reassembly just re-assemble the aperature unit then attach the groove tube as shown
There are two groove notches as shown in the photo. Slide the 2 notches into the 2 grooves exactly as shown.. push in until they twist into the groove.
Line up groove and attach the front tube. Use the marks you made to line everything up and reverse the disassembly to finish assembly. If you need help you can always drop us an email.