AZ Carbide teardrop scrapper are the best I’ve used on an articulating hollowing device.
Here are a few photos of what I made up to sand inside hollow forms as long as the opening is larger than 1 1/2". I often also use them on vase shapes. It has a handle that is about 16" long.The rounded end does a nice job of the bottom.
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Pete
* It's better to be a lion for a day than a sheep for life - Sister Elizabeth Kenny *
I think this equates nicely to wood turning as well . . . . .