Barton 90139 Owner's Manual And Safety Instructions page 7

U nfold top top cover (part M) and attach to assembled parts
Step 9.
(part G&H) as shown below. Attach finial to hub (part H) of
assembled parts (part G,H&M) to secure together.
Step 10. Attach assembled parts (part G,H,J&M) to connectors (part I)
of assembled parts (part A,B,C,D,E,F,I,L&K) using short bolts
(part #1), washers (part #3) and allen key (part #4).
NOTE: Please fully tighten all bolts at this time.
#3
#1
#4
M
7
#1
X4
X4
#3