to the spacer 4 and attaching the spacer 4 to the roof purlin 3 the fixing pin 5 has a shaft 6 with a drill point 7 for drilling through the panel element 2 the spacer 4 and into the purlin 3 the spacer 4 and the panel element 2 are formed separately and are not attached to each other during production the spacer 4 and the panel element 2 are provided to the intended site of use detached from one another the spacer 4 is magnetically coupled to the purlin 3 on site due to the spacer 4 being magnetic and the purlin 3 being of a metallic material the translucent panel element 2 is then placed resting on top of the spacer 4 with the longitudinal axis of the panel element 2 substantially perpendicular to the longitudinal axis of the spacer 4 on site the fixing pin 5 is then extended through the panel element 2 into the spacer 4 and through the spacer 4 into the purlin 3 by means of drilling in this manner the panel element 2 is attached to the spacer 4 on site and the spacer 4 is attached to the purlin 3 on site overall the panel element 2 is effectively attached to the purlin 3 on site via the spacer 4 by means of the fixing pin 5 because the spacer 4 is not attached to the panel element 2 during production this enables the user to adjust the position of the spacer 4 relative to the panel element 2 on site and to adjust the position of the spacer 4 relative to the purlin 3 on site to ensure that all of the components the panel element 2 the spacer 4 and the purlin 3 are in the desired position.