It may interest some to know that Quest Outfitters now has 125 degree elbows, in addition to the 90 and 145 degree elbows it has carried for some time in Easton .340" OD tempered tent pole tubing.
Unfortunately, ferrules continue to be attached, and are not optional.
But the ferrules can be cut off where they protrude out of the elbow, and the material left inside drilled out to the desired diameter. The ID of the ferrules is a little over .21", or 5.5mm, and the ID of the .340" tube is around .290". In drilling out some of the ferrule material, I wouldn't want to damage or cut the .340" tube in any way, as the higly tempered aluminum alloy is a little bit like glass in its response to surface cuts.
Quest has stated in the past that you can remove the ferrules with heat. But unfortunately, that will destroy the uniquely high temper that is critical to the elbow maintaining its angle. Otherwise, these are very strong elbows, worthy of consideration, I think.