9. Where a projection is deemed to be in collision with the testing device it shall – (a)in the case of a plate, have corners the radius of curvature of which is 2mm.; and (b)in the case of a stem – (i)if its diameter is less than 20mm, not be longer than half of its diameter; (ii)if its diameter is 20mm or more, not have edges at its end of less than 2 mm. |