The recommendations I was sent for people willing to service DSLRs, SLRs and lenses are:
This is an active list of good repairers – my friend has used a couple of them:
https://www.35mmc.com/17/07/2016/specialist-film-camera-repair-modification-companies/
The two links below also get good reviews, but he has no personal experience of their work.
https://www.cameraworks-uk.com/camera-repairs-and-servicing
https://pppcameras.co.uk/about
However, it must be remembered a 60mm lens may be out of their comfort zone of expertise.
He also warns that there are people out there who will do a poor job and charge you a lot, so you may prefer to watch a lot of youtube videos and then do it yourself.
