I'm hauling tomorrow, the primary reason is a failing torsional coupler. This is the device, sometimes called a damper, that lives between the flywheel of my 6BT and the input shaft of the Twin Disc MG5050 gear. I replaced mine in 2012, about 1800 hrs ago. The OEM coupler made 4800 hrs. I suspect the failure, a bit premature, was hastened by an oil leak that originated from the input shaft of the gear. An O-ring provides a seal for that splined shaft at the back of the coupler, the O-ring dislodged during assembly, unbeknownst to me until I discovered oil in the drip pan. About a qt per day from GA to the Chesapeake, only for the quick trip there, when I replaced the O-ring, but the rubber elements in the coupler don't like oil, and they had a pretty good bath. I'll know more upon disassembly and post mortem, but it is a reasonable conclusion. My conversation with Centa focused on probable cause and best remedy. They concurred that my DS (dual stage) coupler does not like oil, that I could send them pieces for analysis, they can also refurbish the coupler. They also advised that there is a newer "R" series coupler that is still progressive, but uses a different design that allows for field replacement of the elements, is more robust, generally less vibration and has 6 elements spaced over a wider diameter than the DS. It's also about 70% more cost, and is not stocked. It has a 4-5 week lead time from the factory in Germany. They emailed a quote and a full cut sheet of the coupler, the quote included the new "R" series, a replacement "DS" series, as well as cost to refurbish my existing coupler. The "R" series is more robust, so I pulled the trigger on the new design despite being a bit more than $850 with shipping. The order was placed 3/20, it gave an estimated ship date of 4/25, and we discussed options to expedite. Shipping was the only variable in lead time, and $270 in direct air shipping from Germany would shave a week off delivery time. Not worthwhile to me. My point here is to share the level of service Centa provided from initial contact through delivery, which the tracking indicates will be tomorrow, the 27th. Every email was answered promptly, they actually read my emails gauging from their response, and replies to people who were out for the day were promptly answered by another staff member who was versed on the order and was able to reply with an appropriate answer. Every question was answered thoroughly and promptly. I sent a follow up email the week prior to estimated ship, and was assured that "I would have it next week". I was expecting it early the following week based on UPS from IL, so scheduled the haul to straddle best/worst case delivery. I received an unsolicited email confirmation when the part shipped out. Tracking indicates arrival tomorrow, fully 2 business days ahead of what I anticipated, so I'm tickled that I won't be sitting on the hard awaiting a part that was promised and not delivered, as so often happens in this situation. This is my 2nd time dealing with Centa, I've been thoroughly impressed with their service and heartily recommend them. ------- Steve Sipe MTOA #3962 Solo 4303 /Maerin/ Ortega, JAX