Originally posted by monochrome And there's this : Lens Tech Home Page for Ralph Innes. I've heard he's very good if he's still in business.
As I recall he posted a message saying he no longer repairs lenses due to age related disabilities.several years ago. It wouldn't hurt to try contacting him though. My understanding was he was to go to person for Kiron lens repair.
Precision ball bearings starting at 1mm in diameter are easily bought from a US manufacturer on EBay. I bought a packet of 1.5mm ball bearings (50 count) for just a few bucks when I lost the detent bearing for my SMC-A 50mm f/1.7 lens.
You can find parts lists for many Kiron lenses
here. Boggy hasn't put the parts list up for the 105mm f/2.8 Macro yet but if you contact him maybe he'll get around to doing it.if he has a copy. As I recall there is a bit of interchangeability between many of the Kiron models.
Edit: Looking through the available parts manuals the Kino (Kiron) designs that have ball bearings on the aperture ring all have from 75-80 1.6mm bearings.