Stop that clanging!

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saying

Contributor
Scuba Instructor
Messages
344
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Location
Laie, HI
# of dives
500 - 999
Not really a story with a moral, something just kinda funny.

The scene: Molassas Reef of Key Largo last weekend.

About an hour dive at 20 feet. Very leisurely puttering around a reef frightening the fish on the second (and last) dive of the day. Somewhere around 45 minutes in my tanks starts shifting back and forth. That is; my STA starts shifting back and forth on the plate every time I shift my weight from one side to the other.

My first impulse is to take off my rig, tighten the bolts down, and keep heading back to the mooring line. But some little voice in the back of my head kept whispering, "Just leave it alone. You're going to be out of the water in a few minutes anyway. Just leave it."

So I reach back and hold the tank valve for the rest of the swim back, just to minimize movement.

As SOON as I step out of the water I feel a HUGE shift in weight that almost pulls me off the ladder back into the slightly bucking sea.

"Yeah," says the captain as he helps me onto the gunwale, "Looks like you lost a bolt, there."

The top wingnut had come off and vanished into the reef somewhere. The bottom one was shortly on it's way to follow. If I had taken off my rig, that probably would have done it. My wing would rocket to the surface, and I'd have been swimming back to the boat with my tank under my arm. As it is, I'm surprised the STA didn't crack and neither of the bolts bent.

Thank god for those little voices. And the ubiquity of Home Depot. $1.50 worth of spare wingnuts and washers and the diving continued on Sunday. This time, with the wingnuts tightened down enough to hurt my knuckles.
 
Use lock washers.
 
Better yet, trash the wing nuts all together and use SS locking nuts with the nylon inserts. They will not come loose even if they are not properly tightened.
 
*writing down the info*

good story and good lesson
 
Or just do like OE2X (during our Fundies class) and try diving your tank "sidemount" ... :11:

... Bob (Grateful Diver)
 
Give your nuts a tweak before you put on your BP/W. I also have a few spares (along with a host of other stuff) just in case one of those bolts comes off. I use lock washers too under the wingnut.
 
simbrooks:
Give your nuts a tweak before you put on your BP/W. I also have a few spares (along with a host of other stuff) just in case one of those bolts comes off. I use lock washers too under the wingnut.

Guys, always be sure, as Simbrooks suggests, to give your nuts a tweak before you go diving! :eyebrow:

Rob
 
Was using lock-washers.

The captain of the boat told a tale of how he's seen nylon insert wing nuts, which sounds awesome... but they don't seem like an off the rack item.

Edited to add:
Huh. Who'da thunk it?
 
I'll just betcha Home Depot has 'em.......and for a reasonable price, too.
 
You might try an actual hardware store where the clerk knows what your talking about. I swear Home Despot hires zombies.

Jim
 

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