[sdiy] English to Dutch (powersupply/plug?) conversion ?

[mango]

Hi all,

I'm getting a synth with an English 3-pronged powerplug
and would like to modify it to a 2-Pronged Dutch powerplug.
The synth itself wants 230V 50Hz and we have 220V 50Hz here, but i've
been assured that is okay. (true?)

Now here's my other question:
I've opened the English plug with a screwdriver and saw that inside it
the left prong was connected with a blue wire, the right prong was
connected with a brown wire,
the 3rd prong that is on top doesn't seem to be connected at all, and
then there is a fuse in it that is labeled '3 Amp'.
I have been TOLD by the seller that i would need to get a Dutch plug
(which has 2 prongs) and then connect one wire to one prong and the
other to another prong, and it doesn't even matter which wire is
connected to which prong... because, he said, "it's alternating current
anyway".

Does this all sound right ? I am *very* newbie and don't want to fry the
synth, and i *definately* don't want to fry myself!

Btw, what about the fuse ?
And does it really not matter how the cables are connected ?
And what about the ground pin that is on the English plug ? Don't we
have a ground here ? etc.

Thanks very much for the help you can give me !

Joel

P.S. the powercable itself is hardwired i believe they call it to
somewhere inside the synth, so it's not some model you can just buy an
entire new cable for and plug it into some socket on the back of the
synth.