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Hi, I haven't seen that particular portable pier, but that design was pretty well standard for large scopes until the 1990's. I think they phased them out because the tripod was a cheaper alternative. I have found them very stable especially with larger scopes. Here's a pic of my HEQ5pro (with 10" f4.8 on top) on an adapted cave optical (1970"s) portable pier. I have since moved to a bolt down pier. I leave the mount on it and cover it with a plastic bin on top between imaging sessions.
Rick
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