A frost plug blow out in the bad weather on the cefiro...its at the back off the head..there is a plug directly in the middel off the head just level with the end off the rocker cover well the one im after is directly under that..does anyone no the measurements off the plug...as its gone,and i cant see the hole 2 measure it i can only get my hand in there!!the cefiro has a rb20det engien!

