i got one from germany (ebay) "Gravierstichel 3,175x115mm 60°x0,32mm VHM f. Pantograph"

then i found some cheeper ones in france (ebay) "1 fraise à graver(long taille) 3,175*60°0,25mm V-type"

iv been looking into sharpening them whilst still in the motor... it would need a jig making.... should get some good use out of them if they can be sharpend without to much hassle

the worry for me are the bearings on the nose, im convinced they will need cooling unless you splash out on ceramic ones and at those prices id still want to cool them, at 48000rpm they were very hot in under a minute, it might stay cool if you use one bearing but i think the runout will suffer, it needs some research

the other spindles are fine, i managed to hole-saw 25mm for my Y screw with the large one... had to take my time though, it keept tripping out my power supply