Good advice there from Jim. If wherever you are is sufficiently drier than where Hammy is (and, Ireland being Ireland, there’s always a good chance!) for the rings to fall off, it means the wood around the slides is also under considerable tension. I’m not in favour of indescriminate use of dampits, but you can’t get into trouble if you use a dampit in conjunction with a small hygrometer. Make sure it is working properly though - some of them I’ve seen can be 30% out. Compare it with a known reliable unit, or even put it outside and listen for the weather report on the local news! You can usually get inside them to recalibrate them (the end of the spring is attached to a moveable plate, usually secured with a drop of fingernail polish), or just mark where it ought to be.
I’d also check with Hammy on what he’d recommend on tightening the rings. Unless he has a better plan, here’s my usual advice:
Fixing loose rings
The rings on wooden flutes are more than decorative. Those on the sockets are vital reinforcement for the thin wood. Wood can handle a lot of compressive load, but not ruptive. Rings can become loose when the wood shrinks after a spell of dry weather. There is an easy fix for loose rings. It’s called “the old handkerchief trick” …
Remove the ring, noting which way it goes on easiest, and set it aside. Take a small piece of thin cloth - a scrap of worn handkerchief is usually ideal. Don’t overdo it by using too thick a cloth as this will have the effect of narrowing the socket mouth.
Holding the joint vertical, with the offending end uppermost, put the cloth over the end. (If this is a section with a tuning slide sticking out, you’ll need to make a rough hole in the cloth to let the slide through, or just bunch it up enough)
Take up the ring, being careful to keep it the right way up and push it onto the end, pinning the cloth underneath it. It shouldn’t go on very far. Now force it on most of the way by either of the following two methods (But remember - don’t go all the way just yet!)
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Tap it down equally all round with a soft faced mallet, or a piece of wood. If you use this method on the socket end of a headjoint, remove the cap from the other end of the headjoint first to prevent it being damaged. (It should just unscrew or twist off. If it won’t, use a bit of dowel to push both cork stopper and cap off. Remember to set the stopper back in the right place later!)
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Press or tap the ring against something unyielding like the desktop (if you don’t mind denting the desktop!)
(Again, if this is a section with a slide sticking out, you have to work carefully around the slide.)
Whichever method, stop when there’s about 0.5 mm or 1/32" all round left to go.
Now, with a sharp razor blade or scalpel, cut away the spare cloth from around the ring. Make sure the blade cuts into the 0.5mm or 1/32" gap, so it won’t leave visible marks on the wood or leave scraps of cloth remaining. Once the scraps are neatly gone, continue to press or tap the ring completely home. Now use your razor blade again to remove the cloth covering the hole at the end of the joint.
All of this might sound a bit daunting, but it actually takes less time to do than to read about! The cloth, being resilient, will almost assuredly prevent the ring coming free again.
Terry