Leaky pushrod tubes

["Jack W. Drews" <vinttr4@forbin.com>]

Anybody got a fix for leaky pushrod tubes?

I milled my TR4A head .125 for my vintage racer. Thereafter, the
aluminum pushrod tubes seep oil around the head/tube joint, some at the
top and some at the bottom.

I tried expanding the tubes with a tapered punch. I tried sealing them
top and bottom with epoxy. Neither worked.

It's not a big emergency, but just a nagging cleanup problem.

What's the latest and greatest solution for this one?