I've replaced the fuses with glass ones because I couldn't find picofuses anywhere near:
http://orange.users.sbb.co.yu/Amiga/rust/P8100010.JPGlooks a bit ugly, its just a temporary solution until picofuses arrive. Important thing is that A520 RF modulator now WORKS on A2000 and external FDD, too. :-)
BTW, there should be no other problem with using glass fuses other than fitting them, right?