Yeah, no way will that fit on a non LP grand. That's a 22mm atomizer and if I recall the standard grand will not except anything larger than 14mm.
If you want to use the Odin on your grand you have a couple of options. If you feel up for the task, you could file down the catch cup on your grand. If you don't want to DIY then send it back to Rob at reos
mods and he can do it.
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