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Here are couple of ideas. You could use pins: Or axles with studs on the end: Or axle connectors and axles:
These parts do not come apart. They are designed to be clicked into place and then remain connected. I have not found nor heard of a way that these can be separated without damaging the plastic and hence the functioning of the part. The assembled component has part number 99009c01 - Technic Turntable Small, Complete Assembly with Black Outside Gear Section.
Also, part 99009 and Part 99010 is another one that is extremely hard to disassemble as highlight in this question. (The current brick separator will not work in this situation.)
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