Modern Vespa

Yes, bought 2 new handlebar end plugs for my 500, and this morning tried to replace the old ones.

They are attached using an allen bolt, so I get my allen tip in my screwdriver, applied force and... the bolt didn't move, but its head is now rounded, so it's impossible to unscrew the bolt

Any idea how can I unscrew this f*****g bolt?

Drill off the head, take off the old end-weight, spin off the remaining stub with pliers/mole-grips, whatever.

Thanks a lot for the tip, will try that.

Now I have another problem with the other side

The bolt went out easily, and the end plug, but the new one dont fit. The new bolt is different size, and the plug itself need to be inserted more than the original.

Looking at the new one, it's supposed to be replaced fully (also the inside part of the handlebar, subber + nut), but mine is stuck.

I tried pulling from the bolt while almost totally unscrew, but no luck...

Probably this part should be also drilled away... can anyone confirm this, please?

Adding a pic of the new ones.

hamer a torx in and use less pressure and will come loose

An easyout tool is want you need...
Any good tool supplier will assist you....
Aldens would be your best bet....
Maksors method is the simplest if you have some torx bits.
http://www.bmwscotter.org/tools/easy-out/easy-out.htm

Ahem - you are trying to affix a bar-end designed for open-ended bars. The Piaggio range of bikes have welded-in 6mm nuts - just get some 6mm bolts of a suitable length and forget the expansion rubber and nut'n'bolt provided with your esoteric bar-ends.

Yes, I went to Lowe's and bought one of those. But it didn't work. The bolt was too soft for the tool to grab it

The torx I tried also didn't work.

The first drill I tried got broken in the process... luccky me, also bought a new set of titanium grade drills, and one of this did the job, and the bolt is out!

I found the problem... the bolt was GLUED !!! I guessed that... but even using that method the new one don't fit in the handlebar, so I need to search for another one, or just paint the olds... (they have some scratches, thats why I want to replace them)

Thanks again for the help

Dang, did you piss someone off in a previous life? Good luck with your project?