Attaching a shelf in existing holes

[Jodgello]

Hello!
I want to mount a shelf on the wall in my living room, there are 4 existing holes in the wall that fit my brackets, I would like to use them to avoid making new ones. The wall in question is a 20 mm particle board and the holes are about 8 mm in diameter. Is it okay to insert plugs into the holes and then screw into them or do I need to drill new holes?

What would hold the most weight, plugs in the existing holes or screwing with wood screws in new holes?

Regards

 

[etompau]

There were some large holes. It should be possible to insert a suitable plug into the wall.

 

[nimhed]

Can't you glue dowels in the holes and then screw with wood screws? http://www.biltema.se/sv/Bygg/Faste...-tillbehor/Plugg/Trapluggar-50-st-2000020115/

 

[ZipLock]

Plasterboard anchor should work well in an 8 mm hole.

 

[Liteavvarje]

There are so-called gummexspanders, they expand on the backside like a large bulge and are very strong. There is a type available at Bauhaus for a 26 mm wall.