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Yes, Nigel - pretty standard looking chinese secondary mirror mechanism.
Here's what I did to replace the three collimation screws without buying Bob's knobs:-
"Lastly, finished off my knobs for the secondary mirror tilt. I'd grown sick of the Philips head screws, so found some long M4 bolts (cabinet handle fittings are M4), found some of the wooden plugs that fit into screw holes on furniture, drilled through these, added a few nuts and washers and I had Eric's Knobs. Only trouble, they very slightly protruded into the light path, so I filed flutes into the wood to significantly reduce this, with the added advantage of increasing the grip, gave them a paint and reinstalled and rechecked and reset collimation."
Let me know if you want a photo.
You said :- "If nothing else I have learned a fair bit about how a Newtonian telsecope works." Hurray! Once you know how things work, you are so much closer to 1) getting the best out of them, and 2) improving them.
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