Originally Posted by
obrentharris
I have Paragon Machine Works blocks. Very nice quality.
Some people make their own out of a block of hardwood, using a hole saw of the correct diameter for the bore and a thin kerf saw (bandsaw) to split the block.
Brent
As Brent has mentioned you can make your own...my only addition/sugestion that I would be to use a Forstner bit, if used slowly I have found the cuts much cleaner and less likely to have rough edges in the bore .
Cabinet and furniture makers use these.
Best, Ben