Having decided it was time to start using my Mamiya C330f again I thought I would run through the shutter speeds etc on the 3 lenses I use. All were ok except the 80mm blue dot which now has a really rough noisy movement to the aperture ring. Can anyone recommend somewhere in the UK that they have used to repair/service this lens? I have looked on the web but, as usual, it seems everyone and his brother services every make of camera/lens ever made. Unfortunately as we all know, what the advert says and what some people can actually do, are often not the same. I would appreciate any advice/recommendation from someone who has had work done on a Mamiya tlr lens. I would much prefer getting this one repaired than buying another, to avoid the possibility of being in the same situation soon after buying a s/h lens.