Hi Michelle.
As far as I know the Terrey Hills Pony Club was an idea that never happened. The night sky there was just not dark enough to get anyone interested on a regular basis.
The closest regular meeting to you would probable be the Pony Club at Mangrove Mt. (see Pony Club in November thread). It's about a 90 minute drive from Avalon.
Also there seems to be a small group trying to arrange something at Randwick this Friday.
Collimators are generally specific to the type of scope you have.
Did you buy it from an astro shop?
Perhaps they can advise you.
gb.
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