Round pin shackle with no cotter pin!

Colin

Well-Known Member
Just had to share this horrific oversight I discovered while taking a closer look at something else today. This shot is looking through the grid at one of the batten hanging chains for our motorized austrian main curtain. A few things are wrong here, but notice especially in the middle of the photo the EMPTY cotter pin hole at the end of the shackle pin. WTF?!



Although it has almost surely been this way since installation 13 years ago, I missed it in my rigging inspection earlier this month, and an ETCP inspector didn't see it in the previous inspection either. Sometimes the little things count!

We don't have a lift to reach it, so a 2 minute fix becomes a big headache with a timeframe of TBD. I'm locking and tagging the curtain controls, leaving it flown out so nobody can tug on it, and closing the fire curtain to keep people from walking under it. Maybe extreme measures considering it has been this way for a very long time without incident. That part is heartening, but then again one of my other inspection notes was that the hanging chains are way out of plumb, causing them to pull the batten into the austrian lift lines, which I was about to fix by wrestling the chains (where they inappropriately wrap the grid, side loading links...) into plumb. That sure could have popped this pin out.
 
Are you sure that's not just a mousing pin? I've seen threaded shackles with cotter pin holes for mousing rather than securing

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Are you sure that's not just a mousing pin? I've seen threaded shackles with cotter pin holes for mousing rather than securing

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I know, I couldn't believe my eyes either but after a triple take it is definitely just an unthreaded pin. Unfortunately this installation predates the proliferation of the safety bolt style shackles/turnbuckles with thread plus pin hole. So we have to be extra careful about avoiding slack conditions and such that might rotate some hardware and load a cotter pin.
 
I would take a long piece of wire and fish it into the pin hole. Certainly that is no substitute for a cotter pin. but it could serve temporary duty till you can arrange for proper access .
 
Fishing a wire should be pretty easy. Its the same method you use to fish a rod thru a car door while putting slight bends in it until you can hit the unlock button.
 
Everything go okay today?
 
Wow... glad to see this was taken care of safely.

OP you should submit this to Clancy's Scary Rigging Photo of the Week. Looks like it hasnt been updated in a few months, but I bet they'll post this!

Scary stuff and a huge oversight by the installer unless it was somehow (doubtfully in this instance) knocked off.

The reason we saw loose pin shackles go out of fashion beginning in the mid-late 80s was over concerns that the cotter pin could be broken loose during travel. A number of theatre consultants began specifying screw pin shackles and they quickly became the standard.
 
Screw-pin shackles certainly can help one sleep at night, not like their counterparts you are always reasonably assured that they are secured.

I agree, that would fit well with JR Clancy's scary rigging photo of the week, which I miss seeing every week. Great entertainment (as long as I know that the bad rigging is far away from me!).
 
OP you should submit this to Clancy's Scary Rigging Photo of the Week. Looks like it hasnt been updated in a few months, but I bet they'll post this!

Good call. That hadn't crossed my mind. I sent it in and they said it would go up "when Scary Rigging resumes". When that will be I don't know, but I had an awesome time visiting the facebook page for the first time in ages.
 

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