Mavic Open Pro rims are available in 36H in many places around the 'net. It seems they have fixed the loosening nipple problems and you should look no further for a light (425g) new set of rims. MA3's (470g) are also available in 36H aluminum flavor, very similar to MA2.
If a bike is a "rider", i personally favor spreading it to 126 mm. Factory replacement axles for your nuovo record hubs are available from loose screws, or from renaissance cycles, or generic ones for $5 from your local bike shop through wheels manufacturing or whatnot. so don't trash your hubs - just upgrade them to 6/7 speed. Sunrace makes some nice inexpensive 7 speed freewheels that work great. Suntour 7 speed freewheels show up all the time on ebay at outstanding prices, and they never wear out.
There was a discussion that I initiated last summer about running a cassette on a 120 mm rear axle. impossible (EXCEPT if you can find the elusive campag 7-speed cassette hub, one's on british ebay right now.) however, it's fairly easy to run 8 speeds (1 cog removed from a 9 speed) on 7-speed cassette hubs that are still available. Harric Cyclery has some nice shimano 105 cassette hubsets for 126 mm.
http://www.sheldonbrown.com/
The consensus last summer was that it was not a good idea to cold set or otherwise bend a 120 mm frameset to run 130 mm spacing.
- Don Gillies
San Diego, CA