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The bleed kit for my Tekro HDC 330 hydraulic brakes did not come with a bleed block. I've seen a 15mm ring spanner mentioned as a suitable alternative, but would prefer to make/buy the correct tool.
What size/thickness of block is needed?
This model of Tektro brake uses a Shimano M575/M505/M445 brake pad - so I ordered the Shimano bleed block for these brakes (p/n Y8FZ05000) which did the job.
I have a hydraulic piston press, and it's 3.7mm thick. I don't know if that's a standard across the board or if it's just this one though.
Required, but never shown