It’s sounds counter intuitive but paddling is wonderful and easy to become addicted. I have found it’s almost meditative for me and I love being on the water. It can def lead to calluses on your palms but I don’t find a great deal of pressure on individual fingers the way climbing holds can exert. It’s uniform and you can control how hard you push yourself. It’s not like “if I don’t use 100% I’m gonna fall”.
Food for thought maybe…
Good luck finding a new adventure!
Looks like a locking pin where the groove sits against a sprung ball bearing. Easy enough to insert and release but prevents two parts from moving in a perpendicular path to the pin. Can be used to stop pivoting too.
Makes me think of the kind of pin that you pull out to lift up the seat of a rowing machine to store it vertically.