I have 3 Konrads. All of which 'blob' totally out of the blue. Yesterday I heat set one, twice in 2 minutes microwaved water, likely close to boiling. Dipped for about 30 seconds, pressed as per video.
filled with Noodlers black... Fingers crossed, cheap(ish) paper. Two sides of A4, expecting the worst. .... It was fine.
Today using it on my diary, nice paper. Half a sheet of A4. So far so good. My hopes are raised Brian! I'll let you know.
Bit like a bad garage though, it will take ages before I trust the pen again!