Hey Ari,
I'm goin thru my KMV right now, replacing all the bellows-retaining hardware with new screws, nuts, etc... I've ordered a new set of bellows from Custom Bellows in the UK, they should be arriving soon. Other than those things, I've found that the following things help aid in getting the best pictures possible with my KMV, some are more just simple maintenance:
1. Use an $1-2 A clamp to secure the rear standard when doing final focus and lock down prior to inserting the film holder(see picture below)
2. If needed, replace the light trap velvet. The search function here will turn up some threads dedicated to this topic, some in the past few weeks.
3. I've not used ANY 'lubricant', dry or wet, on the focusing track or on the extension bed. I just cleaned the rear track with a very stiff bristled old toothbrush I keep in my toolbox, and did the same thing to the front extension sliders.
4. Get out and make pictures
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