Ah, but this is the cheapo Dunlop model. The chuck does not thread
on. It merely bolts to a faceplate that is welded(?) to the main
shaft. That plate itself is not square.

Thanks anyway,

Gene Horr
my name as one word at texas dot net

You mean Dunlap? What model is it? All the ones I've seen had narrow threaded
spindles.

GTO(John)