It’s disputed, but I believe they were. I’m in the camp that believes the connecting tube was permanently attached to the top half, acting as a counterweight and allowing the pezhetairos to wield it as a spear. The back half could be attached to turn it into a pike. Multi-role.https://twitter.com/loudpenitent/status/1230587346229198848 …
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This is a case, my sense is, where the casual reader might proceed unaware that the evidence for the two-part-and-sleeve sarisa is actually very weak and that a fair sized chunk of specialists in the field don't think it was real (Connolly and Sekunda both reconstruct without)
But because there's no definitive evidence it *isn't* the case - just an argument from silence in the literary/representational sources - you don't get a strong statement in the literature as to that skepticism and so the reader is left to assume consensus where there is none.