yep, the first seal often leaks. You need that socket, also available from metalnerd, or you can just hammer on a smaller socket but this obviously damages the bolt.
I have some pics that I have been trying to organize, here they are.
The torx bolts are t26 or t30, I forget which.
The short ones are 35mm long and have a 6mm thick head, so the shaft is 29mm long.
The long triangle bolt goes through 2 layers and is 69mm-7mm head, 29mm threaded, in case you want to replace it.