Grabbed Superuser-3.1.3-arm-signed.zip from Superuser
extracted the su and superuser.apk to root of where adb.exe is.
Some of this you can possibly cut out but I was basically just trying different things til I got it to work plus i wanted the su and superuser.apk on root of sdcard incase needed again.
I'm on win 8 pro so I had to set it to run as admin for adb to even work.
mount -o rw,remount -t yaffs1 /dev/block/system /system
adb push su /sdcard/
adb push superuser.apk /sdcard/
cp /sdcard/su /system/bin/
cp /sdcard/superuser.apk /system/app/
Don't have to reboot I don't think but always best to so you don't have to set read-only on system again. check to see if you have root with root check basic or whatever app you want.
Let me know if it works for you. I'd even consider starting a remote session and trying it if anyone would be up for it.
I'm pretty sure that's all I had to do.