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I bought a full set for my GSO 12" last week from Bintel in Sydney. When I asked for them, Don asked if my scope originally had any knobs or just screws. It seems there are two different thread sizes on these scopes over the years.
When installing the secondary knobs, they felt like they were the correct thread, but were very tight, but once I put some (very little) silicone grease on the threads, they went in like the proverbial rat up a drainpipe.
Cheers,
Jason.
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