Don't be intimidated by the swap. It's not rocket science and really not difficult. You will need an x-acto knife, some super glue and a small Phillips head.
You'll need the X-acto to trim down the disc that fits into the housing of the original Bane torso (depending on which arms you are using, the discs will probably be larger than the the ones on the original Bane arms, so they won't fit into the slots in the torso without shaving them down).
I think I have some pics of my arm swap using the TTM20's (I also beefed up the neck and trimmed the 20's arms to have an even deeper bend for a better boss pose). If this would help anyone still doing the mod, I can dig them up and post them
You'll need the X-acto to trim down the disc that fits into the housing of the original Bane torso (depending on which arms you are using, the discs will probably be larger than the the ones on the original Bane arms, so they won't fit into the slots in the torso without shaving them down).
I think I have some pics of my arm swap using the TTM20's (I also beefed up the neck and trimmed the 20's arms to have an even deeper bend for a better boss pose). If this would help anyone still doing the mod, I can dig them up and post them