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Internal routing is in for all 53 and 49's.
As a process it's quite hard to automate, which I assume is why you rarely see it on production frames (made of steel) as ideally you'd just use an end mill at the angle the liner came in at, but these thin tubes are too snatchy so you'd probably have a lot of wastage. Process for us is drill 7mm hole, then file into shape. I do loads of internal routing so it's not a big job for me, gives us something over a lot of other frames, and just looks better so all in all might as well. Have swapped to brass routing for ease of maliabilty and also as we can spec the lengths of these much more than the stainless (500mm, too short, or 1000mm, too long.
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