"If I only had a..."

Nowadays men and women have boob jobs and nose jobs and all manner of bodily enhancements and adjustments, so it seems logical to me that the Tin Man might, if he went to a plastic surgeon, want a bigger funnel. No, wait, hang on, it wouldn't be a plastic surgeon. It would have to be some sort of metal-worker. An ironsmith. But then the joke wouldn't really work...