Dave, problem is they wear on the round sides, not on the end, so it would be difficult to regain the roundness, I suppose some tedious hand filing might work, awkward but possible
"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics