I had a home made cutter that centred in the bore and was hand operated on a screw feed that could be manually adjusted. This was done in the car.

All you had to do was make a rag plug in the bore and coat with grease then block all the galleries with grease. The "O" ring slot is only 0.040" (1 mm) wide and 0.020" (0.5mm) depth for 0.040 (1mm) anealled stainless wire. This only makes a very small amount of cast iron cuttings.

Its not as difficult as it sounds.