Welding caps on U-joints

[LukeandI]

I have a 76 dana 44 we are using as a donor axle for our 70k10. The new axle u-joints (Moog 371)have inner c-clips that don't seem to want to go in. I have shaved the inside of the yoke to get them in but they don't seem to seat properly. I have seen on another forum that guys will spot weld the caps to the yoke to keep them from walking out...does anyone have experience or advise on this. If we do this should I put the greasable joints in? Thanks in advance...Rick