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I've just took the auto safety off my SPR310S last week. So this is what I did. I referred to the parts diagram in the manual first to understand how the parts worked. 

* Disclaimer, this is for illustration purposes only. Do not attempt unless you fully accept all consequences (and benefits). 

Gathered a medium & wide flat screwdrivers, thin long nose pliers, bobby pin (safety pin) and a piece of clean paper/cloth. 

1. Used the medium flat screwdriver and unscrew #67 & #68 butt plate screws from the #66 butt plate. 
2. Used the wide flat screwdriver to remove the #63 stock screw from the #66 butt stock. 
3. Used the medium flat screwdriver to remove the #61 trigger guard screw. 
4. Pulled off the #62 stock. 
5. Unscrewed the #60 trigger guard. 
6. Located the #35 safety button and the #43 slider that activates when depressing the #16 top lever to open the action. Noticed the #36 safety base & 37 safety lock pivots back and forth when the #35 safety button is moved between safe to fire. In order to remove the #43 slider which makes the 'automatic safety' feature possible, the #35 safety button and #36 safety base assembly must be removed. 
7. Noticed the #35 safety button is held together by #38 pin that holds the #40 spring and #65 washer onto the bottom of the # 35 safety button. 
7. Placed the receiver on a level flat surface with a clean piece of paper/cloth underneath to catch any falling small parts. 
7. Used the thin long nose pliers to compress the #65 washer. 
8. Used the bobby pin to push out the #38 pin. 
9. Removed the #35 safety button. 
9. Located #36 safety base which is held together by another #38 pin. (Noticed that the #37 safety lock is attached to the #36 safety base and pivots. Keeped the #37 safety lock attached to the #36 safety base. Remembered the part positions for reassembling.) 
10. Used the bobby pin to push out the #38 safety pin to remove the #36 safety base. 
11. With the long thin nose plier, removed the #43 slider by pulling it through where the #36 safety base and #35 safety button was just removed. The #43 slider has several angled bends so it needed to be pulled in several angles to remove. 
12. Reversed the operation above. Saved the #43 slider to reassemble if ever needed.