coil

Hi, Just bought a new copper cylinder and looking inside, the central heating coil is rippled. From what I understand ripples are bad and can result in erosion over time. Since I want this cylinder to last 20 years would it be better to return it? Am I making something out of nothing? Thanks...

All, I was trying to put back an old TS 350 for taking bits and pieces from several saw I had on the shed parked through the year and mostly with no spark. I removed a coil from one case which seems to be showing 5.9K om and put into a semi complete case with cylinder etc etc. fitted a...