I've seen an adaptor made from a piece of PVC pipe (big enough to fit over the eyepiece) with three screws to lock onto the eyepiece. The pipe is glued onto a flat piece of timber with a 1/4" bolt through it in the right place to screw into the tripod socket in the camera. This locks the camera to the eyepiece.
These type of adaptors are available at Bintel and other astro shops.
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