Many thanks to you who have earlier posted leather pump cup conditioning suggestions. Despite this little Prabhat stove (newly bought) arriving with bone-dry, stiff as a board leather, the conditioning worked and it fired up first try. Now I need to chase down a kerosene weep from the riser tube/tank junction. And I'm amused that one face of the air bleed screw face reads "Primus." Prabhat was licensed by Primus at one time, I read.