Transformer buzz: Williams power supply

tmcw

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Further to the thread I began here http://forums.arcade-museum.com/showthread.php?t=179973 , I determined that the buzz was coming from the transformer.

I took it out today to have a closer look (Trans.jpg).

When I look at the back of the transformer, I can see that the "shroud" that goes around the block has come away from the block, so there is now a gap (Back.jpg). And sure enough when I put the power board back into the game, and stuck a wooden spoon against the back of the transformer, closing the gap, the buzzing was dampened significantly.

So, now I'm wondering how best to tackle this? The link RetroHacker gave me in the other thread shows how you can use some sort of cement to stick the bits that come loose back to the block. The issue I see is with the extra bit that goes around the whole block outside this loose layer, the bit that has the paper cover with Williams and the code number printed on it.

I can see that the outer layer seems to be soldered/welded together at the side (Side.jpg). Will i need to remove this layer too, or would I get away with stuffing cement down into the gap, and clamping it up, or has anyone who has dealt with this scenario before have any better ideas?
 

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