if you already have a TSA, you could theoretically buy some halo B shells and mod it with some simple soldering skills and whatnot.
the boards on both are roughly the same size, and the backplates are close, but the TSA's is smaller. all you'd have to do is lengthen the wires from the board to the motor, use a halo B drive cone and rig up a way to connect the 9 volts from the front of the shells to the board where the contacts are. after that you'll be riding the gravy train, with a slower, sound activated Halo A(the old gear drive style) or you could just buy a new halo or reloader B..
but where's the fun in that?