I say possible, because I don't know if this is the fault of Open Blocks or ToolBelt, but I figure I'll report it here. Using the Open Blocks grave so I imagine it's some kind of conflict (fortunately reload inventory from OB worked) and if it works properly with other more popular grave mods then it's probably more an OB issue. I haven't died lately (that was my 1st and only this game) so I don't know if it is reproduceable or a 1 off.

Oh, and love to see items that didn't make it to from Tinkers 1 to Tinkers 2 so thanks for this mod. Does seem a little silly that it needs to be upgraded to get full 9, but I know making things harder than they need to be is all the rage these days and that's what crafttweaker is for. Otherwise great job!

Thanks for the report! I tried with a couple other grave mods, and they worked correctly. I'll have to grab Openblocks and test with it, but I don't know what else I could be expected to do: I'm dropping the items in exactly the same way vanilla items are dropped, so anything capturing the drops would also capture my items. If Openblocks is trying to be clever... it would technically not be my fault.

WRT upgrades and Tinkers, I didn't come up with the idea while thinking of tinkers 1. I was rather thinking of the Thaumcraft focus pouch and the menu it would show to switch between them. I decided to require upgrading because I thought giving people 9 slots for only a couple leather and string, was way too cheap, and I didn't want to require some random shit like a nether star, which I felt was way too overused as a means of gating. So the anvil upgrading process was my initial thought as a means to provide slight gating (you have to put in the effort of crafting the pouches, and gathering the XP, but anyone can do it with just a little bit of patience).

I'm considering, for a future 1.14.x version, to add a sewing station, possibly as a separate mod, and have a simple tiered needle / tiered string concept, with an UI a bit like the vanilla stonecutter.