The most rebuildable pump I know are the Silcas. I have one that dates back to the 80’s and it works fine. Second to that is the Rennkompressor. Both can be rebuilt and have been around for ages. Every other pump I’ve had can’t hold a candle to these two.

All that aside, any new pump I get gets fitted with a Silca head.

As far as portable on-the-bike pumps go, I like the Silca Tattico. Two versions, one has a BT sensor built in and you get pressure on your smartphone. Or there is a sensorless version. Very easy to pump tires, very small size. Impressive pump.

J.