JFYI, even though "unGrateful" persons have said it is improper to answer questions of which one does not have the exact equipment, I do have the similar Oly 770SW and Oly housing which has a similar diffuser on the housing. I carefully removed the diffuser, it is held with very small screws, this should allow you to affix the strobe cable with your mask. Later I purchased the Inon AD adapter but in this case I don't think there is an application for the PT-043.
Initially, before purchasing the Inon adapter, not realizing there was such a thing, I fabricated a small stainless steel shield using the removed diffuser as a pattern. I then attached the cable to the fabricated shield. I placed in between the shield and the housing a small piece of rubber with a slit cut in it and the piece of soft rubber was adhered to the stainless shield with 1300L. Once the small screws were pulled tight the slit was compressed which would pinch the optical cable. I did have pics on photobucket to link but I erased them all today, sorry. The system worked but the AD adapter was more factory looking so it is long gone into the graveyard of other less than brilliant ideas. You can probably dream up something similar. Good luck. N