Make rectify cylinders of a Daewoo Racer 1.5 block from Std to 0.50. I buy x the pistons and rings 0.50 Now my question when measuring the light between the tips in the 1st compression or fire ring remains at 0.20mm loose and 0.25mm tight. According to the manual, it tells me 0.30. With light at 0.20mm they could come to run into the tips once it is running. And it is so convenient to spend the tips of the rings a bit.