This
http://www.radioshack.com/product/index.jsp?productId=3964901 worked for me. I have completely removed the numpad cluster and rewired this with the circuitwriter to make the poor mans SSK. I also found it is pretty flexible and does not fall off/come off as expected. HOWEVER you have to follow some precautions:
1. Get the newer pens, as the older pens may be somewhat dry and not so free flowing. Chitchat with the RSH guy and be nice to him/her and he will tell you if these are new stock.
2. Play with a scrap piece of plastic to draw. This does not have a pen like tip, rather a tube and a tapered bit at the end and when you press the pen down the internal taper of the bit opens up for the fluid to flow down. So it is continuous at a certain pressure and travel, and below that it is lumpy and above that it is spotty.
3. prepare the surface with a tiny bit of plastic modeling cement/acetone. Test a tiny bit of cement over some unused tracks. It SHOULD dissolve existing track/silver as well as leave a small residue. I found this actually leaves a somewhat compatible surface for the circuitwriter to hold on (the contains a little bit of acetone? that dissolves the surface but not enough to make a solid bond).
4. You have to draw 2 times, the first time draw in one pass and let it dry under a table lamp (10-12 inches from it), leave for at least 6-10 hours. Magically it will be conducting then. Then go over it using a lighted jewelers loupe and check for any restrictions in the track. You may go over this the second time and again leave under the light for another 12 hours.
5. Note that this creates much thicker lines than the existing few micron ones. Use a scale to rest/slide your drawing arm for a uniform line.
I could get about 50 ohms between a 2mm wide track over the foil width (8-inch?). So this is pretty good. I also tried to scratch this with nail as well as sandpaper and it is holding on. It worked for me great and I believe this will work for you very nicely.
If this work, leave a note and it will be very useful for others in repair situation.
Cost:
circuitwriter 23$ radio shack
jewelers loupe 7-10$ frys/online
a steel scale 5$? anywhere
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Getting a broken SSK work: Priceless