Found a 3 piece kit for reaming glow plugs out of the UK...

Amazon.com: Draper 23240 Expert 3 Piece Glow Plug Reamer Kit: Automotive

There is a company over there called Laser that has a similar kit... price seems fair.. anyone else used this kit before?

Looking to use them on my 85 OM617 and also my 87 OM603. In the future having the one for the 606 would be nice as well..

Right now, I have 3 GP's testing open on the 603... 3 5 and 6. So I'm ordering new bosch and new intake gasket to do the job... might as well do the reaming as well..