I have taken both my robos apart for tuning, polishing, and general nosiness. If the robo spring broke, something crazy happened, as it is a long, leaf type spring, that spreads the torque across a rather long arc, not very prone to breakage, although stuff happens of course.
1. have proper fitting drivers.
2. take clip off so everything lays flat
3. lay the knife with the right hand side (if holding the knife in hand edge down) on the table/bench
4. carefully remove the back screws and push/tap out the opposite side
5. remove the stop screw, and push/tap out the opposite side
6. remove the pivot screw, and " " "
7. now very carefully, and slowly remove the left side of the handle
8. make sure to make note of the washer config. as it must be repeated properly for good function.
9. the spring should be staring at you, lying in the right handle, and there should be a small nub/pivot point on the blade that the spring works on.
10. clean everything, apply a light coat of quality lube to everything that touches anything that moves, I use Tetra, but whatever suits you.
11. re-assemble and before really tightening it all down check for function. If it all works right, then snug all the back end down good, and slowly and carefully snug the stop & pivot screws to allow proper tension, eliminate blade play, and center blade when closed.
I was moving quick, and might have left out some junk, so I guess this is my feeble attempt at a disclaimer. Good luck!!!
