In my opinion, the best way to restore MX1000 is to buy a full set of NOS Dia Compe 901 brakes (come with calipers, pads, cables, all fixings, levers and even 2 cable clips) for £40ish, and use the MX1000 arms with all the hardware from the 901 set.
You then have much nicer looking MX1000 with nos spindles, weinmanns, pads, cables etc. You can even make up the 901's with whats left to get a few quid back.
NOS 901 sets have to be one of the remaining bargains of OS bmx.