Running on memories these days but while going back down that pprune link I suddenly saw this mental image of the impossible.
I went back to DC3's for my first command and reintroduced myself to cyclic boots. Let a layer build up. Okay, it was forming fast, how much ice? I'd guess I'd got 20mm or so. I turned the big rotating valve behind the FO. I think it was there, but a 50 year old memory. It was then the impossible happened. The ice came off okay but then a 10 foot length of it rotated damn nigh exactly 90 degrees and stopped. We flew for several minutes with this chunk proving just how structurally strong ice can be.
No. Yet again, no darn camera when you want one.