you can make your own halo inductors from the great guide made by tom at arielfx:http://www.arielfx.com/inductor_guide/guide.htm
you can get the parts at the cave:
halo inductor: http://www.smallbearelec.com/Detail.bok?no=368
and the #38 wire also at the cave:http://www.smallbearelec.com/Detail.bok?no=438
i just finished making my own halo (510mH / 29.5 ohms) last night and it sounds great actually a lot easier then i thought.
patience is the key and thouroughly reading the guide is a must. but you can do it. you can even wind them by hand provided you keep tension on the wire without breaking it and count in your head the number of turns.
or if you need them quick i would try the yellow fasel the one i pulled out to put in the halo i made was 680mH and something like 21 ohms. but it doesn't compare to my halo. you don't have to stick to the dunlop called for 660mH. i also true bypassed the wah and changed some values from other wah mod suggestions. Â hope this helps.
I also want to give a big thank you to tom at arielfx and steve at the cave without these two, winding halo's would probably be this big mystery. instead by provideing the guide and the parts these two have helped me achieve a really good sounding wah that i can't wait to show off. thanks boys.