I made some gust locks that I used on my RV-4 for many years.
I don't have any pics but will try to describe them.
When I cut the lightening holes in the wing ribs, I saved the circles and used a few of them for gust locks.
Basically, I took the 3" and 4" diameter aluminum disks and glued a piece of 1/2" foam to one side. Then I put a 3" #6 screw through the holes in the center of the disks and a wing nut to hold them together.
I put a piece of duct tape around the screw in the middle section of threads so only the end inch or so had usable threads showing..
The gust lock then slips above and below the aileron, elevator tip, rudder tip, or whatever, with the foam side of the disk against the paint and the duct taped threads in the slot between the surfaces.
I put one on each aileron and one on each elevator tip and one on the rudder top. I used the 3" disks for the elevator and rudder.
They are a little bulky but very light. I carried them in a cloth bag with my tiedowns.