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Infrared-RF 433-Bluetooth Arduino Remote
Control Any Circuit With a TV Remote (and an Arduino)
I think the best way to describe the pressure is by looking at the picture above where it shows the water spraying up... I am happy with the design and it works well, but if I were making it again, I would use the pens.
I agree, that's exactly what I ordered. You can get a pack of different sizes for around $9 shipped. As soon as they arrive, I will update the pictures.
For the test, I took a small bolt and put some shrink tub around it. This worked for a test run. Looking back, it would have been better to take two bolts and put the head end together and shrink wrap it. That would have created a nice pivot point. The one I made clanked around a little bit. The best thing to use is an actual stir bar. You can get them on Amazon.
Magnetic Stir PlateView Instructable »