About this detail of the Tiger
To allow it to recoil, the Tiger's KwK36 gun was carried in two large bushings. I have not seen them nor any images of them, but knowing that the KwK36 was a scaled-up version of the KwK24, I will extrapolate from that gun's design.
The bushings in the KwK24 were made of brass and had 4 internal grooves to distribute lubricating oil. The position of the oil taps on the KwK36 suggests that it had 6 grooves, as shown here. The internal diameter is known because it is the diameter of the gun barrel.
The bushings were carried in a metal sleeve of 280mm diameter. A box structure made of welded plates completed the gun cradle. The main plates are shown in this sectional diagram (looking from above).
This diagram shows the complete cradle installed in the mantlet, as seen from above. There are two oil taps for lubricating the bushings.
These filling taps are numbered (43) on the Tiger Lubrication Chart. They should be filled "before each prolonged action".
This German photograph shows the cradle as seen from the commander's seat. The breech of the gun is closest to us. Immediately ahead of it is the rear plate of the gun cradle. There is a handwheel on top of the cradle, part of the gun tube seal. At the base of the handwheel, the two oil taps can be seen.
This is the rear plate, seen from behind. It has gaps for the recuperator tubes at each side. The breech slams forward into this plate after a recoil, hitting four pads that are bolted to the plate.
Here, we are inside the Early Tiger at Bovington museum, before restoration. This is the top of the cradle (the breech was painted green by the British). You can see that the breech rests against one of the four pads. Although painted 'ivory' like the rest of the gun, these pads were made of leather strips tightly sewn together, with a metal base.
This is the front plate of the cradle, as seen from behind. Twelve large bolts attach the cradle to the mantlet. The diagram also shows four steel webs that were welded between the front and back plates to form a rigid box.
This detail is from Plate 24 of the Turret Manual. It shows the inside bottom of the mantlet drum, looking from above. It has two raised tabs, drilled to take the bolts of the gun cradle. Two more tabs are on the top of the opening.
This is the Late Tiger of Saumur museum. The top of the gun's breech is closest to the camera, and beyond that we can see the gun cradle and the bolts fixing it into the mantlet.(The latest version of this article)