I have a 20+ year old 4-piece mortising chisel & bit set made by FISCH, the Austrian Co. I tried to use them once when I got them but never really successfully. I have a project where it would be ideal to be able to use the set. The prior poor results I believe was because I didn't have it set properly. I don't think I understand and still may be missing the point (pun) of how to set the clearance between the chisel and bit. I may have misread/misunderstood the diagram that came with the set, showing a clearance required between the chisel and bit of 1/16" to 1/32". My understanding of that is: If you let the chisel and bit touch the piece at the same time, that won't work. The bit is supposed to touch the piece about 1/16" to 1/32" before the chisel touches the piece. So far that hasn't worked well. Where have I gone wrong? Thanks for any insight into this. Guidance from experienced users of these devices is what I should have looked for sooner.