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OK, here is the new counterweight shaft. Started out as 400mm x 25mm of 316 stainless
Machined to 20mm diameter for 80mm, then 25mm for 2mm, then 23.8mm.
Counterweights bored to 24mm. ( beware this will expose the horrible casting flaws in these weights!)
Declination collar bored to 24mm, - problem with China manufacture, hole not concentric with fine threaded section of the collar.
Solution was to machine the shaft down a fraction of a mm in way of the collar only.
Now the force of the balance weights is properly taken up by the steel declination shaft and not on the fine threads of the aluminium collar.
Shaft can be made any length you wish.
A lot cheaper than the Altair Astro option from the UK
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