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Hmmm.. so I got my order of the new Hero 616Plus delivered almost for a week and of course instantly I tear off the packaging and get to the pen and was keen on trying to see how it goes, but even a single eyeball give me suspicions .. hard to say but I sense something really different here .. call it a hunch whatever and well ... my engineering spirit just had to prop up .. so out come all the current retro hooded models and my calipar, well even without the calipar I can see something there and some measurements proved that am on the right track . OK let's hack these open then so I gather in the lot Wing Sung 601, Wing Sung 613, Hero 616Plus and a current production Hero 616 ( std / mid / jumbo ) First the barrels, caps, and sections; well look like we should give Hero 616 credit where credits due ( all these models simply show that they were all based on the old 616 in general layout / size / profile ) ... guess what ............ they are all the same bar the finishing and colours, I can use any of the hood on any of the 4 pens without issues , Caps likewise, but well .... barrels ... well actually their external dimension is the same but they have different threading machined / molded .. the 601 of course had its own barrel / ink container, the 616Plus barrel actually now spotted 4 re-enforcement rib inside barrel end and thus will not fit the other models. The current 616 and the 613 barrel interchange but they will not fit the 616Plus having too short a threaded part making them screwed in short Now here's the interesting part , the innards of all 4 pen ( sort of ) From top, Wing Sung 601 , Hero 616 , Wing Sung 613 & finally Hero 616PLus ...................... first thing first notice the different ink collector ; the 601 and 616 use ABS while the 613 use plastic ( polycarbonite likely , transparent clearly for the Demo ), and the 616Plus, well there's no ink collector at all .. Then the nib ... except for the old 616 .. all of them now use the 18.5X3.3mm hooded nib, yes the new 616Plus do not re use the old 616 nib but now use the same as Wing Sung so you are welcomed to put onto it all those nice fat calligraphy options; Now carefully check the ink collector nib end ... all of them had a rounded straight tubular part at this end which usually hold the nib and also engage the hood inside ( which had a like shaped indent to mate to that ) sealing the whole assembly .. this is molded in with the ink collector but its a separate silicone composite part on the new 616PLus. As you can see there is a black part inside the outer transparent coupler part on the 616Plus and this is actually the locking sleeve which also hold the ink nipple for the converter, this is machine push fitted into the transparent coupler and sealed in there is the integral single piece ink collector feed which then are sealed shut barrel end by another piece which sit the ink nipple / converter acceptance part. The mentioned front piece of silicone sealing plug on the front just go onto the feed from the front and can be pulled off, it will snugly fit into the hood / section's inner indent ( and sometime stuck there when that unscrewed ). Except for the 616Plus, all of the ink collector can be simply pulled off from the coupler straight. Which of course give us all the misery of trying to match the nib position to the hood. The 616Plus simply is all fixed and you screw in the hood and it either fit right or its not ( and all 4 fit right ) Guess Hero does not just went out and put C/C onto the 616, they rework the whole mechanism but retain the general profile / size / styling .. not a bad job , and nicely done indeed, and now I am going to figure how I want to put them back together .. you know there's literally loads and loads of color combo to be had , and finally there's one single model I did not put here, the Wing Sung 3006 which, even without a calipar; I can clearly see that its based on a different sized pen ( its size actually the same as the Hero 329-2 )