Can I Switch a Maillard 27 hub for a Helicomatic?

Hello BF,

I have a Helicomatic rear hub from a 1984 Trek 620 with 27" wheels (about which I have posted previously) that has pitted adjustable cones - need to repair/replace in some manner. I was going to try to replace the adjustable cones, but I have a set of 1980's (?) 700c take-off wheels...