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How can I solve my Master Magic? Right now I have the shape equivalent of the magic shape where you fold it in half and shift over twice, and then opened up.

EDIT: exactly this shape:

 
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what happens if i put my mefferts megaminx springs in my rubik's.com 3x3 DIY ?
Will the 3x3x3 get too tight?

I don't know, what does happen if you put mefferts megaminx springs in a rubik's.com DIY? If you have both things, why don't you find out? If you don't, I have no idea why you'd bother trying as the idea itself sounds a little far-fetched.
 
Those algorithms don't exist. The reason the Niklas commutator is of order 3 is because it does a 3-cycle of centers. That fact becomes more apparent if you perform it on a supercube.
The reason that those algorithms don't exist is because you're asking for an algorithm that does an overall odd number of swaps. On cubes, it's simply impossible for only two pieces to be exchanged.

EDIT, AGAIN:
For some reason, I had it in my head that you were working with a supercube. I suppose there is an algorithm that does a swap of two indistinguishable centers and also swaps the two centers that are not solved. That can exist, it's an even number of swaps. But I'm not sure that's what you're looking for, I don't know what you're using this for.

Two corners can be swapped on a 2x2x2 :confused:

Actually, 2 corners aren't being swapped. 3 corners are being swapped and it appears to be two. I think.
No, he's right- do a T perm on a solved 2x2. I didn't think about 2x2. I was thinking about 3x3 and larger.

em no it is a three cycle i think because if you do an A perm on a solve 2x2 you still get a bar and two pieces that need to be swapped and if you do it on a 3x3 you can see that 3 pieces need to be swapped:S??
 
Those algorithms don't exist. The reason the Niklas commutator is of order 3 is because it does a 3-cycle of centers. That fact becomes more apparent if you perform it on a supercube.
The reason that those algorithms don't exist is because you're asking for an algorithm that does an overall odd number of swaps. On cubes, it's simply impossible for only two pieces to be exchanged.

EDIT, AGAIN:
For some reason, I had it in my head that you were working with a supercube. I suppose there is an algorithm that does a swap of two indistinguishable centers and also swaps the two centers that are not solved. That can exist, it's an even number of swaps. But I'm not sure that's what you're looking for, I don't know what you're using this for.

Two corners can be swapped on a 2x2x2 :confused:

Actually, 2 corners aren't being swapped. 3 corners are being swapped and it appears to be two. I think.
No, he's right- do a T perm on a solved 2x2. I didn't think about 2x2. I was thinking about 3x3 and larger.

em no it is a three cycle i think because if you do an A perm on a solve 2x2 you still get a bar and two pieces that need to be swapped and if you do it on a 3x3 you can see that 3 pieces need to be swapped:S??

You can't tell what edges have moved on a 2x2 (due to them being internal) and thus (ignoring AUF) a 2 swap and 3 cycle have the same effect.
 
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