In 1919 cellist Friedrich Wilhelm Ludwig Grützmacher ( 1866-1919 ) , the nephew of Friedrich Wilhelm Grützmacher , died , and Klengel recommended Feuermann for Grützmacher 's position at the Gürzenich Conservatory in Cologne .
Klengel was a good teacher for him In 1919 Friedrich Grützmacher died and Klengel recommended Feuermann should take his job at the Gürzenich Conservatory in Cologne .