Good contribution from Vitor regarding the back PP boards .
Would like to touch on something ....
For the sucker best get those black colour can stick longer however costlier.
For punching holes thru the pp board for the sucker to go thru , can buy those small leather holes puncher in hardware shop which cost about $3 to $5 . Easy and swift saving the hassle to burn screwdriver to melt thru .
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