REFLECTOR: countersinking

[Grigore Rosu]

Hi,

I'd like to get a countersink and just noticed the note in the 
Velocity manual that aviation countersinks must be 100 degrees, unlike 
non-aviation ones which can be anywhere between 60 and 120 degrees.

Found one at aircraft spruce, 
http://www.aircraftspruce.com/catalog/topages/microstopcountersink.php,
but it seems a bit expensive ($40).  Does anybody have any suggestion for 
beginners?  I don't mind buying the one from aircraft spruce if it is 
really good and indispensible.

Thanks,
Grigore