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Thanks for the comments Sheeny,
Its actually now that I measured it properly 140mm pipe. Yes I have access to centre bolt as it runs the length of the pier and can be adjusted at the bottom of the pier via 2 locked nuts on a threaded rod.
Its actually for a refractor, the plan is to have my 103 and 80mm vixen apos as imager and guider. Its probably taller than most piers because I am taller!
If you want sheeny I have made 2 of these (why do 1 when you can do 2 for double the effort!) that I was going to mount out in a dark sky area, feel free to borrow and try it out.
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