Originally Posted by
12boy
I think a little duct tape or gorilla tape would work very well. Does the little finger protrusion go into to seat post slot as well to keep the saddle straight ahead as well?
Yes indeed.
I made one of those from aluminium tube which I had lying around.
In making a keeper yourself it gets tricky to make the sheet metal stick to the seatpost tube close enough so that it slides fine into the interior of the seat tube extension. Using a piece of another tube to make the keeper should indeed help in getting the keeper stick close to seatpost surface.