Swing Shaft (2in1)

Swing Shaft is a reconstruction of the level of the same name in vanilla Super Monkey Ball 2. It is the 29th and penultimate Advanced stage.

Description
The player starts on a platform shaped like the letter D, with the flat-most bit being only 1 ball-width wide. There is also an identical platform with the goal in the distance facing the other way, with the goal. Both of these platforms have a handle at the bottom, and are connected by a large pole. Between these two platforms is a large rectangular block that's swings back and forth, using the pole as its axis. There are also a bunch of smaller blocks evenly spaced down the middle of this platform.

Goal tutorial
Choose a side and wait for the block to tilt towards you. Roll onto the block and start rolling towards the other platform. Try to remain on the side of the block that's tilted higher than the other one. To switch sides, carefully slide between two of the smaller blocks. It's also possible to run all the way to the other side without slowing down but this can be tricky. The hardest part of the level is to board the goal platform, as it requires you to roll onto a 1.0 wire that's perpendicular to the tilting block. To get onto this wire, wait for the side of the block you're on to tilt up, and then carefully roll onto this wire. Once you make it to the bananas, you're home free.

Differences from vanilla
The starting position is on the curved section of the first D-shaped platform. The typical starting bridge and even the smaller square platform before the actual level have been removed.

In the vanilla games, this stage is Expert 39 (being the final Volcanic Magma stage) as well as being located in World 8. It was brought down to Advanced 29 because it's generally agreed to be far easier than many of the surrounding stages, if not the easiest World 8 stage (save for Linear Seesaws, which was made harder in 2in1).

Also, Swing Shaft in 2in1 uses the cycles found in the Clock Tower Factory variant instead of the Volcanic Magma variant. In Clock Tower, it tilts every 5 seconds. In Volcanic Magma, it tilts every 3, presumably to spice it up for Expert. Why the two have different speeds is unknown.

Trivia
There is an identical copy of this stage in debug 371, but instead themed towards the Sky High world instead. Given that the stage is too hard for Advanced 6-9 (let alone Beginner 6-10) and that Sky High doesn't appear in Expert, why this port exists is completely unknown.