Wacom Graphire4 Tablet - always draws

I have an old Wacom Graphire4 drawing tablet that I've had for many years (and hadn't used it for several). I recently started trying to use it again but kept coming up with a fault. Anytime I used the pen, it registered as drawing, even if it was hovering over the tablet.

I tried every driver under the sun and even did a complete clean install on a fresh system. Nadda.

After a lot of hunting around online and reading other people who'd had similar symptoms, I determined that it was a mechanical issue with the pen. I'll post the fix I found here, and my notes and results below.

Online workaround:

Utilising the Universal Low-Tech Gadget Fix method (aka "Hit the bloody thing"), I've managed to get my pen to work properly again!

1. Plug in your tablet, and remove the tip from your pen if possible (don't worry if you can't though).
2. Open the Tablet control panel in System Preferences.
3. Hold down Opt (or Alt, or ) while clicking the "About" button to get to the diagnostic screen.
4. Hold the pen near the tablet (not touching it) so it registers on the info pane. Check the "Pressure" reading. Mine was hovering around 50, some other people had it up around 220.
5. Actual solution: Bang the pen, side on, against something (the original solution called for a table top, I chickened out and used my thighs to lessen the risk of other damage to the pen). Try 10 hits for starters.
6. Hold the pen to the tablet again. The "Pressure" reading should have drop a little. Sometimes it might not change, but be patient!
7. Repeat steps 5 and 6. Eventually the stuck pressure sensor would loosen, the pressure drop to 0, and the tablet will work properly again. Remember to replace your pen tip if you removed it in step 1.

I hit mine a total of maybe 100 times, gradually using more force at the start until the "Pressure" reading started dropping, then using a similar amount of force thereafter. The pressure dropped slowly from 50 down to 25, then suddenly back to 0, so check the readings often so you don't hit the pen more times than necessary. It is a rather delicate gadget, after all!

If your sensor's stuck under 60 (eg, 50 for mine), and you don't want to hit your pen/can't drop it to zero, you can adjust the "Pressure offset" from 0 to 59; put it to something just above your stuck sensor value (eg, I'd put it to 55 for mine), then you can at least use the tablet, albeit with a slightly reduced pressure sensitivity range.

Disclaimer: YMMV, and this method probably won't work (in fact, will probably make it worse) if your pen actually has a broken magnet/coil/circuit board rather than a stuck pressure sensor. I'm not responsible if you break some other part of your tablet/pen/computer/table/thighs while attempting the repair. If it's under warranty, best to return it to Wacom

End of online workaround

For me, I found the Diagnostic Screen by holding down the Ctrl key and clicking on the "About" button. Initially, my pressure was reading around 268! Definitely not good. I don't know if it is the same with newer drivers, but the one I was using (an older one for a Bamboo tablet) has a maximum software offset of only 59, so that didn't do much for me.

After around half an hour of hitting the pen (initially against my palm, then my thigh, then the mousepad, then directly onto the table edge) I was only able to get my no-tip pressure down to around 180. Still no good for drawing. #SadPanda

No idea how many times I hit it, somewhere in the region of 500 to 1,000 times I figure (I was hitting it quite fast at some stages, and hard enough to worry about leaving marks on the table surface) but that's as low as I could get it.

I might try again, but at the moment I'm really tempted to declare this tablet dead and just chuck it. I could buy a replacement pen, but being an older model they are hard to get hold of and when they do come up on eBay they are more expensive than a whole new tablet. I might try and save up for a new low-end tablet at some stage down the track but I don't see the benefit in investing around $100 on something I'm not going to use much. So for the time being .... back to the drawing board?
badum-tish!