Leckey Mygo User Instructions page 22

To fit the dynamic backrest, insert the strut
into the bottom bracket as shown. Use the
provided screw (c), nut (a), saddle washers (d)
and standard washers (b) to secure in place.
Please ensure that the screw thread protrudes
through the nut (a).
Now raise the dynamic strut and insert into
the top bracket as shown. Using the provided
screw (c), nut (a) and washers (b), secure the
new dynamic backrest in place as shown.
Ensure that the bolt goes through the centre
of the assembly as shown (f). Finally fit the
domed cap (e).
Use caution when assembling and fitting
the dynamic backrest as there is a minor
risk of finger nipping.