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Old 21-10-2014, 11:02 AM
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Merlin66 (Ken)
Spectroscopy Wizard

Merlin66 is offline
 
Join Date: Oct 2005
Location: St Leonards, Vic
Posts: 7,192
Dunk,
Haven't seen them in Oz...
They are usually called T thread locking rings, I got mine from Telescope Service while working in Europe.
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