In article . com,
says...
Little disappointed that I'm having to define a 'corner bead'.
Axminster and Trend both identifiy their router cutters as this.

http://www.trendmachinery.co.uk/prof...9%2F70X1%2F4TC

and

http://www.axminster.co.uk/product.a...sfile=1&jump=0

Now the characteristic of both of these and others is that the groove,
or if you look at the picture of either of these, the bottom section of
the cutter, is square across and what I would prefer from looking at
some older mouldings, is that this is a V, rather than a U, if you
like.

There is no way I'm going to use a scratch block on facings round four
doors, and there is also the possibility that there is 200 ft of pine
to be moulded.

Can't you just make your own granny's tooth to cut the final bit of the
vee?