Just replaced my rear seat bolt on my 15 tri-glide with a 1/4 x 20 eye bolts 4 inch's long. Double nutted . Works great and you can remove it with just your hands.
Any bike running a tour pack can do this as you can not see it after installed. I think the earlier bikes may be a 1/4 x x24 thread.
I thought there ws a thread on here somewhere about this ,but couldn't find it.

 

07 Ultra still has the 1/4-20

 

I know my 92 Heritage had 1/2 x 24 . Don't know when they changed.

 

I know that there are several folks who have done similar things for the seat bolt. I am always looking for anything to make like easier.
Thank you for your idea, might just try it out.

 

Got one of these.......hex wrench
https://www.ebay.com/itm/295154787120


And one of these.........extended seat bolt
https://www.ebay.com/itm/33553229842...CWPJ1EM3JQD4TS

 

OE seat screw for 2019+ Tri Glide.

 

I used a paino key on one for awhile. I had a couple aftermarket ***** but they kept falling out, after two I went back to harley bolt.. Using a screw driver is not awful

 

A riding buddy's wife also rides. She has one of those novelty ones shaped as one of those adult toys, so anything is possible. For her it was easy to get off.

 

bought a 'fancy' bolt once off Ebay or similar, it was rubbing on the back of the seat when riding.
Fearing a hole developing I removed it and tossed it.

 

I have no problems with a using a correct size Philip screwdriver with the TP. Also, the back of the seat flip up a little so the screw stay in the seat tab.