MI-250 GO-TO
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MI- SD Saddle Plate mounting Hole pattern
On older  MI-250 Go-To mounts.
You will need to make sure that the Saddle plates have the necessary clearance for the knobs. Here is a picture of MI-250 new saddle plate on a older mount. If you purchase a Robin Cassidy Plate it also needs a clearance.  I know this because before my mount was upgraded by Larry, the Robin Cassidy plate it had on it had an adapter plate under it.  If you purchase any adapter plate, make sure it's knobs will clear.

Also, you need to make sure that it is not too wide, so that the clutch screws will clear.  On the newer version of the mount, you want to make sure the clutch knobs will clear.
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