I'd like to occasionally use my drift boat oars on my jon boat. The oarlocks have a 5/8" shank but everything I've found so far is for a 1/2" shank and some are pretty cheesy at best. I would also like to use a nylon or delrin insert in the socket for wear and noise. The top of the gunnel is 2 1/2" wide and has a slotted track on the inside. I plan on mounting 1/4" aluminum plate to the track and mounting the sockets to the inside. Due to the gunnel width, I need to raise the oarlocks to get a decent oar angle. I'm starting to think about just using a block of UMHW drilled for the 5/8 shaft. Any and all suggestions appreciated.