Well, heres what I would do. Use spray cleaner around fittings, like when you're looking for leaks in an LP system. You would need to use something (a towel) to keep the wood from getting too wet since it might take several sprays. You might try a few drops of 3in1 oil to lube the cylander also. How fast is the leak? If mine hold air over night or a couple of days, I'm happy.
Edwin