Barry
It is likely no surprise but I would say to make the tools. For under
ten bucks they are hard to beat. A three inch opening is large so almost
anything will get in there. John Jordan has a great video on hollow
turning as does David Ellsworth. Take a look at my website under hollow
forms for a quick intro.
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God bless and safe turning
Darrell Feltmate
Truro, NS, Canada
http://www.roundthewoods.com