What the device for?

[igorponger]

So, why overcomplicate things?
Do you get the idea behind the device?

https://www.aliexpress.com/item/1005009880849160.html

Is it good for attaching ox rubber sheets?

 

[Tyce]

I do this with a sheet of what feels like baking paper, one of those semi translucent protection sheets that come with a rubber. Also used the white plastic sheet from the H3 Neo package before.
It's just to make rubber that's already cut align right

 

[Tony's Table Tennis]

I do this with a sheet of what feels like baking paper, one of those semi translucent protection sheets that come with a rubber. Also used the white plastic sheet from the H3 Neo package before.
It's just to make rubber that's already cut align right

I use any paper, even the one that comes with the rubber (film/base) or even cover.
this is 100% good alignment to the dead center of the blade.