Rewiring transformer on a McCormack dna for 220v

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I understand this transformer can be rewired for operation on 220v by connecting primary windings in series?
Have a look a the picture (love it when manufacturer have a scheme on it like on vintage gear)
I would appreciate a step by step guide on how to proceed. My electronics understanding is limited to changing output devices, caps and simpler stuff.
Do the secondary wiring need to be changed as well?
IMAG0045.jpg

It´s a McCormick DNA 0.5
 
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