The method of joining the base to the dome is undocumented, but most seem to end up gluing them together. I don't like gluing several GBP worth of electronics into an inaccessible housing, so I printed myself a new base for the dome. This has a mounting pillar to fit the homemade Milestag sensor PCBs that I designed. It also has 3 screws to fasten the dome to the base so I can disassemble the sensor when required.
Here is a picture of the sensor PCB and the dome base/fastener washer that I printed:
Here is the sensor PCB fitted to the dome base:
The dome base has three holes for #2 x 6.4mm self tap screws. These fasten the acrylic dome to the ABS base:
Here is the fully assembled unit. Note the two self tap screws on the LHS/RHS of the dome:
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