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In the mirror holder pic you can see the valve springs used for mirror adjustment. This holder is for a 5 inch so it has motorbike valve springs I think they are. Got them from the motorcycle wreckers anyway. The bigger mirror holders use heavier duty ones.
Looks like some castor oil has spilled over the tool after being stored under the sink cabinet. This tool was used to gring a 6 inch mirror. The cat is helping out with photos as usual.
The tube is made from 3mm ply sheet with 12mm ply formers.
Motor drive and hand controller in this pic. I'm using tape to stop the wires from falling off. Have to upgrade to hot melt glue one day. Mount is from an old Tasco refractor from about 1975. Used this with a 5.5 inch scope at the ABC sponsored astronomy evening last night but I use many scopes on this mount. It's what I do most of my astrophotography with!
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