I have the tak clamshell bolted to one end of an Orion 300mm slotted dovetail with two 1/4 or 6mm cap head screws , nuts and washers and a third into the threaded centre hole. This is so I can hang a camera off the front of the dovetail and have a 6mm safety pin in the middle.
I have also used a shorter 200mm prostar dovetail which allows the right spacing at one end in the widened slot for two SS 8mm nuts , bolts and washers. That also allows a handle at the front end of the clamshell to hold on to and safety pin in the middle when mounting in the park position.
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