Dave Walsh, in his article about the Abid Clever, highlighted a problem I had with the theory of filter coffee: the variables you want to be directly proportional to one another (contact time and grind size) turn out to be inversely proportional.
I wanted to try a filter brew of Has Bean’s El Salvador Pacamara but was reluctant to mess with the grind to get it nicely to a 4-minute extraction. Enter duct tape: I stuck it over the holes till the three minute mark then prised it back for the final 30 seconds' drain.
Honestly, I think I got the grind too coarse: I had been aiming for something akin to James Hoffman’s cafetière grind but wound up with something coarser still. Consequently, it was a bit on the weak side but the technique seems to show great promise.