Hi I have a great suggestion to try , take your gearboxes out and use a electric motor spray degreaser and degrease the slipper clutch unit...( I have not seen one yet so I do not know what it looks like) if it's degreased then get tamiya antiwear grease this stuff is like sticky glue and I use it in many open diff RC's and it works great... So what i am saying here is if you put it inside the clicker slipper clutch unit it will hopefully make it harder to slip and click but you still will have a clicker slipper unit that works to protect it.