Stewart golf x seriesf1 umbrella holder atwwwclickgolfcoukthis umbrella holder is designed for use with both the x serieselectric golf trolley of any age and the f1 lithium electricgolf trolleywhen used with the f1 lithium then the umbrella holdersimply screws into the thread location already on the handle foruse with the x1 x3 x5 or x7 fit the black ball into the centreball holder location this is secured in place by a backing plateand screw this black ball can be left in place at