Thank you guys for the replies.
@ Guitargodgt
I have a doubt. The 2 sleeves showed on your pic are for metal screws (I have the same sleeves to fix the speakers). If the other 2 screws are screwed into the wood, it means that you have 2 screws for metal and 2 screws for wood per caster..
@ Guitargodgt
I have a doubt. The 2 sleeves showed on your pic are for metal screws (I have the same sleeves to fix the speakers). If the other 2 screws are screwed into the wood, it means that you have 2 screws for metal and 2 screws for wood per caster..