Old Garcia rod reel seat repair?

[BrianMDTX]

I have an old Garcia K5116 pistol grip 5-1/2’ ML casting rod that I would like to set up with a spare baitcaster, just for the heck of it. I think I’ve owned it since new from somewhere in the mid-70s. The only problem is the reel seat. It’s the type that has a big slotted plastic screw head underneath that loosens and tightens the forward reel seat like a clamp. The screw part is still in the rod, but the upper part of the seat seems to have backed out and is now lost. Any idea where a part such as this may be able to be sourced? And yes, I know it’s likely not “worth it” to repair it, but it was the first casting rod I bought when I was 14-15 years old, and I’ll be 60 this fall. Some old things still work lol. 

[Tywithay]

I've seen whole handles for sale that could probably replace it, but haven't seen the clamp itself. Might try rod builders guild or another builders forum to see if someone has one lying around.