Needle height calibration

[JuKu]

Fyi, I don’t use either spring, the weight of the tube is ok for what I do.

[mikehibbett]

Thanks. I used a tiny amount of pressure on the lower spring - hoping to not need to strip the head down. It's been behaving well on nozzle changes, so fingers crossed!

[mikehibbett]

The final solution was loosening the upper bearing and reseating it, giving the vacuum tube more freedom. I'm now up to 2.2mm backoff, and picking components up & dropping them without resets.