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Old 19-09-2018, 08:42 AM
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Merlin66 (Ken)
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Merlin66 is offline
 
Join Date: Oct 2005
Location: Junortoun Vic
Posts: 8,904
IMHO you need to grind out the lip and get a uniform curve across the blank.
The fastest “comet seeker” I built was. 6” f4.
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