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Author Message   Jeffk Tinkerer Username: Jeffk Post Number: 6 Registered: 10-2011 Rating: N/A Votes: 0 Posted on Tuesday, October 18, 2011 - 08:15 am:    Looks like there are all kinds of commercial adjustable spanners available, but a cut piece of paper shows that the crest of the lens element is below the level of the notches in the ring, meaning I can probably get by with a small aluminum bar cut to the right length and end thickness to span between the notches. More work than I anticipated, but hey, that's part of the fun! That tool will cost me zero since I have the stock, saw and dremel grinder in the garage.