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When I did a BH-90 (using the barb and olive that came included) recently, I had to tap the barb in with a hammer, holding the hose between the yellow plastic blocks in a mini-vise. Was so snug, had to re-clamp the hose a few times.
Screwing the hose-bolt into the lever took so much torque I was almost certain I'd buggered the threads, but unscrewing it was fine and screwing back in again was easy until I hit the olive. The hose-bolt's threads didn't go all the way into the lever body, but it seems fine.
that bad? I tried pulling the hoses out, they are properly secured ..