Are you set on an ‘84 Cannondale?
I have an ‘86 and an ‘88. My ‘86 is just under 126mm. I can fit a slightly less than 128mm into my ‘88 without forcing it at all.
You can probably stuff a 130mm into a 126mm Cannondale, and many will testify to doing so.
I’m in the 128mm or less camp. Getting to 128mm, or less, is pretty easy to do by either swapping out the locknuts or removing, or swapping, the 1.0/1.2mm washers. I found some locknuts that are around 3.5mm and just swapping out 4.5mm ones gets you there.
Personally, I’ve run a 7 speed freehub body off an M732 and mated it to a DA FH-7700 to under 127mm. I’ve also used an M760 with a couple shims, between the body and hub, in that same hub to run an 8 speed cassette just under 128mm.
A 1055/DX-650 7 speed body on 5700 hub was about as easy as it gets and under 128mm.
Ebay will probably be your best bet for what you need. Only problem is things that used to be cheap are expensive.
I also found stainless shim washers in various diameters and thicknesses on eBay from overseas; .2mm, .3mm, .5mm.
Last edited by 70sSanO; 10-08-21 at 09:28 PM.