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Originally Posted by fringe_dweller
my two dobs are virtually collimation free - maybe needs doing once evry two years, if that. but they are long focal lengths f7 10" f6.3 8" in steel tubes - makes a big diff
Kearn
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I eventually did the 'double valve spring' trick on my 3 collimation screws. 75x6 steel strengthening clamp around the 2mm aluminium OTA where the cell is, & the spider end as well.
No wonder the OTA weighs 80 Lbs!
