Same defect 7431.
Yeah sadly we had a bad batch so we are now changing to a threaded pin.
Steffen does the opposite, he creates a mark in the pin by putting it between some hardened pliers, then hammers on the pliers to make a mark in the pin. After that he hammers in the pin.
But yeah, any way would work.
Is Aillio offering replacements? If so, is this something we could get replaced by the vendor we bought it from? For example I bought mine from Sweet Maria’s.
Cheers and thanks!
Yes, you can of course get a replacement if you are unable to fix it yourself.
Bummer to hear that. I thought about scoring the pin like Steffen for a cleaner finished look, but without knowing the hardness of the pin (although it’s stainless, so probably not terribly hard), I didn’t want to possibly wreck the teeth on my good, expensive Knipex pliers. 
I knew the aluminum would move with very little persuasion! 
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Yeah, don’t break your expensive tools. I think the pin is pretty hard.
Thanks @jacob for confirming. I’m waiting to hear back from Sweet Maria’s. They said they would ship a new pin.
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There was another thread about this same problem about the pin on the tryer and some there simply suggested super-glue. Wouldn’t that work?
Heat?
Yeah, definitely heat. The hot/cold cycling would break down the glue bond for sure.
Thanks for the tip! I just set mine up today and had the same problem. I am already sold on the value of the community here.
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My pin fell out and I have no idea where it went. So, I just use it without. Anyone else use it without. Can you get one somewhere?
I’m in the same boat. I can’t find the pin and reached out to Sweet Maria’s where I bought the roaster from. They are working on a solution I was told.
I’ve been still using my pin-less trayer but being more aware of its positioning.
Glue should work fine if you use the right glue.
Or if you’re paranoid: https://www.jbweld.com/product/j-b-extremeheat
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FYI… I received an update from Sweet Maria’s they are waiting on more traders from Aillio and will be shipping me a replacement due to the bad batch. For the others affected by this I would contact the vendor you bought your bullet from to get yours replaced too.
I appreciate the quick response from Sweet Maria’s and Aillio regarding the trayer pin issue. 
I had it happen a couple of times. I pressed it back in place the first time (it was a tight fit) and it happened again. Both times I found it at the bottom of the cooling tray.
Mine appears to be a press fit, not glued in as there was no sign of any glue residue on the pin or in the hole. The problem is that the thermal coefficient of expansion for aluminum is 21-24, and the thermal coefficient of expansion for stainless steel is 10-17, which means aluminum expands more than stainless steel when heated.
I peened the end of the pin slightly to enlarge it and pressed it in using a large vise under a good bit of pressure. It hasn’t come out since.
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Hi all. I’m a new roaster and my pin fell out immediately, so I put the pin in and did a couple of pops with my spring loaded center pin. Easier than holding a punch to it and smacking it. Works great.
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Glad to hear this helped you! I actually tried that way first myself, but I couldn’t keep the tryer from moving around a bit when I was pre-loading the spring. It was easier for me to use the hammer and punch.
I received my new trayer from Sweet Maria’s Monday. It appears they put something in where the pin is seated, almost like a gasket or something to help hold it in. I haven’t roasted with it yet, but I’m confident this one will not fail. I’ll report back after my next roasting session.
I roasted about 8.5lbs of coffee this weekend and the new trayer pin did not fall out. I think they figured out the issue and resolved it moving forward.