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Lathe tools too high

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Shepherduke:
  I have at last got my new mini lathe.  I have a problem in that the suggested 10mm square tools I bought are about a mm too high at the cutting point when inserted in the tool post.  These are tungsten tools.  I cannot get them any lower, so is it feasible to put a small shim under the back end of the tool, to bring the height of the business end lower? As they are tungsten, I'm limited as to how much meat I can remove to attain the correct height.  Apart from grinding off the bottom of the tool to lower it, or getting a smaller square section tool, is there another way?
 Your advice welcomed.

NickG:
Only the tip will be tungsten, do you have a milling machine? If you put a shim under the back it will have a negative rake angle and won't cut well I wouldn't have thought.

Nick

Bernd:
I think Nick has the answer. If you have a mill just take off what is needed on the bottom of the tool.
If not, use your tool post to mill the bttom. Make sure the bottom of the tool faces the chuck squarely. Put a mill in the chuck or collet and mill the tool using the cross slide.

Bernd

NickG:

Bernd, that's a great idea if you don't have a milling machine - never thought of that!

I've got one of those tool holders and it's too big for my lathe so was thinking of taking a skim off the bottom to make it useable, started but it was made of something hard, will need coolant or wreck milling cutters so am waiting for that.

Shepherduke:
 Thanks for all the suggestions.  Unfortunately I do not have milling machine, so reading between the lines I need to remove excess material from the bottom of the tool by grinding.  I suspect it would be easier to solve this problem if I was using HSS tools.
By the way, is it possible to purchase a  stone for a small benchtop grinder to sharpen tungsten tools? I believe they are known as "green" stones.

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