Handlebar bike plug

Expandable, for tubes with inner diameter 20-24 mm, not sure though, I literally just had this idea less than 24 hours ago. It works with a bolt that moves an angled piece to push aside the wedges.

There is nothing holding the wedges with the assembly, but you can use a small bike tube for this (like in the picture), if it still fits in the handlebar. The next version will be a little smaller to hold a ring or a piece of tube to keep the wedges for falling. The nut will also be secured.

Parts:

1 Cap
2 Wedges
1 Expansor
1 M3x16-18 flat head bolt
1 M3 nut