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Hi all, During my teenage years, I've used my mother's TK-Matic. I didn't know it was an iconic pencil at that time, I just loved to write and draw with it. However, one day it either fell out of my hands, or some other thing happened, but the result was, that the pencil didn't work anymore. I've grown up, more than a decade passed. Right now I draw a lot as a part of my job - I'm doing technical designs. I use a Faber Castell TK-Fine Vario mostly, but it just doesn't feel as good. So, I've decided, I'd like to fix that old pencil. I still have it. What's the symptom? Upon pressure, the lead just slides back, like there was nothing to hold it. What did I try so far? I opened and reassembled it multiple times. Sometimes I even tried to reassemble it in different ways. I tried to lead a lead across when its inner workings were outside. It works. Outside, the mechanics hold the lead just fine (pushing it with my thumb), but once put back in, it has the same issue. Nothing seems to be broken, or - according to my best knowledge - missing. I guess it has something to do with the TK-Matic's ability to "automatically" push the lead out as you write, that fails somehow and instead of using the force of pressuring against paper to bring out the lead micron by micron, it just lets the lead pass back a little. I've made sure the lead size is correct (0.5, it was always 0.5 and it's written on it). Are there any ideas on how could it be fixed? Is there any kind of guide how does it look "correctly" from the inside? I really loved that pencil. Thank you very much in advance.