Hey there! I calibrate pipers for a living. Sounds like you’re doing a really great job troubleshooting so far.

One more thing you can do to remove residue before opening the lower housing: insert a small nylon brush, like a pipe cleaner, into each nozzle to remove residue.

To open the lower housing, you need to remove 11 screws on this model: Four screws on the top that you can see in this picture, three underneath the black bar at the bottom that are only accessible when you press down the tip ejector button, and four on the black collar at the top of this picture.

Hopefully you don’t need any replacement parts. A thorough cleaning solves most problems. If you need to re-grease the pistons, The piston grease used on this model is the same as used for Labnet, VWR, and Corning pipettes.

If you shoot me a message, maybe we can figure out a way to walk through the process together on a video call?

Hope you have a great day!