That's probably a good idea then. If a lot of abrasive dirt gets between the cartridges and cups it will also cause wear.
Thanks.
Report:
I ordered and received the bearings Cane Creek brand - and put them in. There was an original top compression split ring, which I re-used- since it seemed fine. I don't know if a seal ring is necessary with the new bearings- Some very very thin "L" profile rings were part of the loose bearing set-up (see photo above ), but I assume those don't go back in...
bottom, I may re-order a bottom race, but I dont have the tool to put it on, so I'll try with the existing race. I dont seem to have a compression split ring on the bottom with original set-up, and diagrams I found online don't show one..ideas?? Is the bottom race doing the job the compression ring does up top?
I greased it all as per an online tutorial.
Any observations appreciated.-
Peter
Now onto maintaining the 9 speed Ultegra brifter.. for another post.