Spring loaded drag engraver

I'm looking into buying a spring loaded drag engraver for my little CNC machine.
The spindle chuck only takes bits with max. 3.175mm shank so I have to make a holder for the spring loaded drag engraver.

I've found these two on ebay at a reasonable price:
http://cgi.ebay.co.uk/ws/eBayISAPI.d...m=320647471935
http://cgi.ebay.co.uk/Diamond-Drag-E...item3f06f7b3be

Have anyone here tried one of these?
which one to choose? :wink:

I bought the spring loaded drag engraving tool from Evildrome which is on this forum as well.
Haven't tested it yet as I have to make a tool holder for it but it's feels pretty tight.

Just wanted to give an update if anyone was interested ;)