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Hi Rob,
Flexure - nasty.
I use a pair of Losmandy dovetail adapter plates that have Losmandy guide rings attached to them. I then attach this setup to a Losmandy dovetail plate. All up about $300.
This is quite rigid. I can still get minor flexure but it isn't very bad.
With the ED80 others can comment, but I think the focuser is a bit on the weak side and may well have flexure in it as well.
You may be best to use an extension tube and bypass the focuser or get a replacement focuser.
Greg.
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