2020 Issue-1
I have an old Leitz Wetzlar Type 31575 slide projector that uses two solenoids for operation by a wired remote for advance and focus. Whatever lubricant was used has thickened too much after too long in storage, keeping the solenoids from operating without coaxing. They are accessible from the bottom access plate intended for lubrication of the associated mechanisms, but removal of the plunger is not possible without a total tear-down top to bottom, which is risky on old equipment with no manuals. I’ve had plastic gears shatter in similar equipment, so that will be my last resort. Wiping down the plungers was not adequate. Something stronger than alcohol is needed.
What sprays would be safe to try, preferably that come with a flexible straw, to dissolve and flush out the sludge? Contact cleaner, such as DeoxIT D5, has a lubricant. Would that interfere with the solenoid operation? Is Fluxoff a safe choice?
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I would differentiate between the situation where the volatile parts of the lubricant have evaporated (e.g. dried out) versus a scenario where the lubricant has become stiff due to adherence of dust to it. In the second case flushing it out would be warranted. Not sure what I would use in that case. It depends on if there are plastics in the immediate vicinity that could be damaged. I would probably try some CFC if you have any, otherwise a generic contact cleaner spray. I would keep cotton balls and swabs to blot up the excess as quickly as possible. WD40 is another option, but again, capture the excess or it will leave a residue. In the dried up case I have had very good luck using additional lubricant to loosen up the viscosity of the original without flushing it out. Unless the plunger is plastic it is highly likely the original lubricant is petroleum based. A very small amount of general purpose lubricant such as 3 in 1 sewing machine oil can be applied and worked in. Mineral oil (from the drug store) will also work. Even very small amounts of WD40 will work, but since it will fairly quickly evaporate (over a few months) you will need to combine it with the oil. If you believe that the original is not pertroleum-based, then a small amount of dishwashing liquid such a Dawn may help. I hope this helps.
