How to engage the PTO?

I'd like to consider myself not an idiot but apparently that's not the case. I bought this mower "as is" at an auction, I've looked all over & can not find a switch or lever that would engage the PTO/blades. The model number is worn off the bottom of the seat so I cant get a owners manual. It's an old MTD Yard Machines. I'm about to go look for the drive belt & go from there, Anyone have any ideas? I operate farm machinery but cant figure out a lawn mower, feel free to pile on the jokes :laughing:.



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