Can you clarify your post? I've never heard of a "topper". Are you concerned about your PTO shaft, or is the concern with some sort of PTO shaft extension?
A lot of PTO attachments use either slip clutches or shear bolts to protect things. A shear bolt is just what it sounds like. When the attachment encounters an obstacle, a cheap replaceable bolt shears (rather than breaking something more expensive). Slip clutches are normally built into the various attachments. I've never seen one that could be added between the tractor PTO and the attachment.
I've never used a PTO "extension" whose sole purpose was to increase the length of the PTO shaft coming from a tractor. I have used "extension" adapters on my early Ford tractor. The adapter fits over the original 1 1/8" shaft for use with attachments designed for a 1 3/8" PTO shaft. The ones that I have purchased in recent years were made in India out of what appears to be pot metal. They all seemed to fail after just a few months use. I finally got tired of replacing them and just replaced my PTO with a 1 3/8" aftermarket upgrade.
An overrunning clutch will not allow the tractor's PTO to continue to turn when the attachment is stopped by an obstruction.
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