I have a very slight leak via the place where my drone switch rod goes in my main stock. Does anyone know a good fix for this? Beeswax immediately comes to mind, but I’m afraid that I’ll need something that has a little less viscous than that since I still want my drone switch to work properly. Thanks!
A snugly fitting brass pipe that you find in shops for modell-ships (or ebay).
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Beeswax is sticky stuff , I’d not use it for this aplication.
I think it best if you can post images of your switch set up showing what sort of air tight ‘gland’ it has ( cork or the telescopic tube that Hans- Jorg suggests or something else)… if the rod is a straight pull or if there is a fulcrum action etc etc. The gland may need replacing due to wear.
Simplest is to take the thing to your (nearest ?) pipemaker.
There ought to be a book on Pipes maintenance but as no offers of money to write one have yet been made and all the people who might be asked are flat out busy. 
Good luck.
Thanks, guys! I’ll try to take and post some pictures.
There is a section on maintenance in “The Union Pipes, A Workbook”
An encyclopedic volume, well worth studying.
Thanks, Mark. You advised me years ago to get that book by Dennis Brooks and I did. I’ve dug it out and am reading it now.