I am at the beginning of a RVI to RVC conversion of a P6 Series One Smiths tacho, The first issue is how to get the bezel off; soaked it in penetrating oil, heating on a stove, stretched the bezel rim a bit with a screwdriver next trying to turn it to and fro by hand when that failed clamped with grinding paper in a vise then by a large cloth covered pipe wrench (dont worry it survived; ), to get tabs in line with the slots, I guess. Is that correct ? If its impossible to turn the bezel what could by the issue ? and what the solution ?