I took apart a couple of servos(standard size) to see what I was up against.
To get to the point shown in the first picture you have to take out the four screws on the bottom and pull off the top cover.
Underneath the gear on the right is the potentiometer, underneath the gear on the left is the motor output. I suggest that you take a picture of it as you disassemble it so that you have a guide to re-assemble it. Next pull off the four gears one at a time. Then romove the two screws that are under the gear on the left. These go directly into the motor. To get it to come apart further you have to push down firmly(but not too firmly) on the stub sticking up (output shaft of the potentiometer) that engages the gear on the right. In so doing you can pop the board out.
Of note the potentiometer has three legs attaching it electrically and mechanically to the printed circuit board. Notice that they are straight. It is therefore an easy thing to pop it out and pop it back in. This is a Traxxas # . I took apart a Futaba S-148 and it is identical. Beware the newer Futaba standard servos S-3003 and ball bearing equiped S-3001. Their three legs are L shaped making them weaker and more difficult to pop back into place after you fill up all this area with silicone. My plan is to apply the silicone first and let it dry. If it still functions then I will go on to the next step.
There are OLD pilots and there are BOLD pilots but there are very few OLD BOLD pilots. MAG