John Lewis Ashton High Sleeper Bed Assembly Instructions Manual page 14

Step 9
Attach Top Panel (1) to assembled Desk and tighten it using Spring Washer (Q) and bolt M6
x 30mm (I) with Alllen Key M4 (A) as shown in diagram below.
Step 10
Attach Table Top Panel (8) to the Side Table Top (1) and tighten it using bolt M6 x 50mm
(G) with the Allen Key M4 (A) as shown in the diagram below.