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I think the Celestrons are made in China, if so it will be a metric thread. Bunnings mostly sell imperial threads. Go to an engineering materials supplier and ask for a socket cap screw. It will probably be an M3 or possibly M4. They come in standard lengths but you can cut and file a longer one to any length you want. If you have a power drill, put the cap head in the drill and with the drill running, you can round the end on a grinding stone. Suppliers of these include companies like Blackwood's, Specialty Fasteners among many others.
Good luck
Joe
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