From the left, ROKKOR-PF helicoid and aperture & focus ring(1),
ROKKOR-PF's LBH(2), spacer from G-Planar 35mm(3), shortened
LBH from G-Planar 35mm(4), and G-Planar 35mm lens block(5).

The second ring(4) from the right is used to make infinity focus
by grinding the bottom (its helical part which has already gone).

1 & 2 and 4 & 5 are connected by screws, then 3 & (4+5) are
glued, thereafter (1+2) & (3+4+5) are glued after adjusting
the aperture range with the body (1+2). This last process
should be done when you installed aperture pin to the body.