I suspect you'll be fine with just the replacement part. The only Ryobi Bar Stud I could find looks to be internal and therefore can't go anywhere to drop out or anything. You may want to stop borrowing, you sound like me. I'd borrow something for a simple few minute or few hour job and the thing would decide to break, so I thought.
- I'd fix, clean, sharpen or re-adjust and re-tune it back to new, to then hear "how'd you fix this or that". It always turned out that they gave it to me broken and why they loaned it...since it couldn't get worse, regardless of my safety and piece of mind. I got tired of being the repairman. In your case, I got a manual Pole Tree Pruner that's still working perfect after 20-years.