Need some assistance repairing a Columbian bench vise

You could ditch the c clip and go with the correct size shaft collar from the hardware store for a better fix.
Actually, I have a small assortment of c-clips for small John Deere axles out in the shed, and one of them (3/4", I believe) worked perfectly!

I cleaned and lubed everything while reassembling it, and the vice works as good as new now.