Although, in all honesty, I don't think it's worthwhile to spend the kind of money a proper CLA costs on an OM-10 or OM-20. Those cameras are worth almost nothing nowadays, even if they are functional. It would be a much better investment to pick up a cheap OM-1n or OM-2n on the 'bay and put the money into CLA'ing one of those bodies. Then you'd have a camera that justifies an investment in the vicinity of $120 on a CLA including shipping