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Thank you all for the advice and support - much appreciated.

I treated the Delrin as if it were Aluminium, medium fast speeds. I turned it up fast when sanding. All done dry as heat wasn't...

...and gave it a go - here's the result of a misspent lunch hour.

https://lh4.googleusercontent.com/-LYuf0CG9Lf4/VT4jmLn2ZtI/AAAAAAAAEgk/i8vSPIHiyLU/w784-h582-no/IMG_20150427_125437.jpg
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