STEPS:

ALL = MOVEABLE

position R = P0
position L = P0

! position MR = ML !  position ML = MR ! L = UNBENT ! R = UNBENT !

position R = position R + P5z

secLB = STATIONARY
secRB = STATIONARY

position sec LT = P90z
position secLT = P180
position secLT = P270z

ALL = MOVEABLE

! TR = P270 ! TL = P90 !

position L = P0
ML = STATIONARY
position secLT = P180
TL GLUED RL

position R = P0
MR = STATIONARY
position secRT = P180
TR GLUED RR

ALL =  MOVEABLE

position MR = MR - 5z
secLT && secLB && secRT && secRB = UNBENT

M[secLT] GLUED M[secLB]
M[secRT] GLUED M[secRB]

position ML = P45 
position MR = P135 + P5z

secRT && secRB = MOVEABLE

secRB + secRT = D

M[D] = STATIONARY

secLT && secLB = STATIONARY

BD = section of D between M[D] and RR, including the section D between M[D] and RT.

BD = STATIONARY

position MR = P90z
position MR = P180
position MR = P270z

ALL = UNGLUED && MOVEABLE

! position MR = P90 ! position ML = P270 !