If you can't get the kit for a Stent, how about making a Worden?
Easily machined and assembled, and a range of accessories to extend what tools can be sharpened .
Like many others, such as Giles Parkes, rather than make a sleeve for each and very drill size, I made an ER 20 collet holder, so that any Drill, End Mill, or Slotting Drill up to 13 mm can be gripped for grinding, as well as lathe tools.
The fixture for Slitting Saws needed modification to be a useable item, but now works well.
With a Diamond wheel, carbide tools can be ground. This enabled me to sharpen an inserted tooth shell mill.
In fact it cuts better than when it was new!
Howard