Quote:
Originally Posted by elinkser
the disk is transparent and angled so there is more precision and repeatability of where you are writing, and even estimate your position better due to well defined center point and angle.
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There isn't really more precision to have. The rounded soft rubber tip is cheapest, easiest to use and works perfectly.
Still €1.50 today in local Limerick shops. Plain anodised aluminium finish (the linked one is coloured).