Although this discussion seems to be hung up on sync cords, I am saying that cords are only a part of my disattisfaction with Ikelite (although cords in general are probably the first thing to go in most camera arsenols.)
So I will answer ATJ's question about should Ikelite test all sync cords. If pressure is a critical performance factor that affects form, fit or function of the cords, then my answer is YES. Ikelite should develop a quality test procedure (like they do for their housings) and test to that critical performance factor. They should not HOPE that pressure won't affect performance, rather test to it or design pressure effects out of the product.
Here are some other examples of real-world problems I've had with Ikelite products that have contributed to my decision to abandon them. Some on here like David Haas seem to think Ike products are invincible and my experience is evidence that they are not.
1. My wife has an Ikelite housing. For it to work it needs a large rubber band, duct tape and 1/4 of a tampon (yes a vaginal insert)!. The camera (an Olympus 5060) does not align with the knobs and levers so the camera has to be forced into a certain position and them locked in place these items. The hotshoe cord slides off the camera with the slightest vibration during a dive so we have to strap it on, using the lend of the camera as the holder of the rubber band. This is the way it still functions today. If you want, I can post an image I sent Ike (when he was alive, bless his soul) of this. His response was basically, holy shit, send it back to us as soon as you get back from Indonesia. I never did. Too frustrated.
2. Not too long ago I purchased four new battery packs for my DS125's. When I tried to put them on the strobe the interlocking forks snapped off because the battery pack connectors were not assembled onto the pack itself correctly by Ikelite. Again I was in the field when this happened.....again I should have conducted my own quality check when I received the batteries. Had to take the time to send back to Ikelite for repair.
3. I had strobes (DS125's again) fail when the electronics faulted. And this has happened many times to my frustration and dismay. The last time it happened and I got them back the knobs were so tight that you could not turn them with one gloved hand. You had to cradle the strobe in your lap to push down on the strobe to gain enough friction to turn the knobs. By the time I composed an image with any moving animal, I would lose that animal because I'd break my composition and stillness by having to change power the way I just explained. Again, I had to send the strobes back to Ikelite to have them repaired once again.
4. As I explained in a previous post I also have DS50's that I purchased not too long ago. I have to tape the on-off knobs in the off position when not in use because the knobs have no mechanical or frictional lock, so they turn on during normal transportation and drain my batteries.
5. And of course you have read my sync cord experience, so no need to rewrite that again.
If you are pro shooter who does this for a living and are spoon fed Ikelite equipment these problems may seem inconsequential to you. Thus my experiences aren't meant to change the minds of the David Haass's and his list of other pros who use Ikelite, rather it is meant to share a factual experience that I have had with Ikelite and allow others to use my 30 years of experience with them to make more informed equipment purchasing decisions. If you choose to go with Ikelite, that's your call, not mine. And you'll never hear me flame Ikelite, either. Virtually everything I have posted here is factual, not fabricated. I have refrained from injecting emotional parodies in the hopes that my posting this is a fair assessment of Ikelite based on my personal experiences.
This is not a two or three issue frustration. I have enough data points from 30 years using Ikelite products that I could probably run a predictive model using regression analysis to determine my future Ikelite failures rates were I to stick with their products. I made the decision to scrap Ikelite knowing that I would have disagreements from people like David Haas (whose work I respect and admire by the way), knowing I would have personal emails siding with me, knowing I would have personal emails bashing me, but the bottom line is I expected it. We are all entitled to our opinions (me and you folks). And it's not about sync cords alone, please don't forget that. It's about my overall experiences with Ikelite.
Joe