Personally I wouldn't use WD40, at least not directly from the can. It'll get everywhere, especially under the aerosol pressure action from the can. This will be very difficult to get off lens surfaces, glass or body, once it's got onto them. If you try a lubricant, I'd use something a little less aggressive such as a solution of washing up liquid, applied in small quantity just where it's needed with a small artists brush.
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