Y9ou have to be carefull because as somebody mentioned, the brake bridge or the bridge between the chainstays can pop out, saw it once.

I have used two rods and with washers and bolts, one at each side then you go turning the bolts the same turns at both side. From 126 to 130 mm the rear end needs to spread around 150 to 160 but it depends on the steel also. Some reynolds is pretty easy to bend, the last bike i did was mine and had Columbus SL (all the tubes) and that one took me like 45 mins doing it really slow. The other thing I did was to put like a belt or a fabric type of cinch below the brake bridge just in case. A friend of mine used to put 2, on in the brake bridge area and the second one round mid chainstay just in case only.

Good luck.