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I made a set of DIY bob's knobs from bunnings with some M4 threaded screws. Cut the head off, then attach the cut end to the knob of your choice - again, I chose a small door pull from the bunnings furniture hardware aisle. They need to be slim enough that they can be installed and still have room to put your fingers around. There is a thread glue for fixing the door pull to the threaded bolt so it doesn't unscrew. This was for my 20" scope, so you may need quite small knobs for an 8".
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