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Yo me he encontrado una manilla para ventanas, muy interesante, por 9 euros
https://www.amazon.es/BESTOMZ-Manilla-ventana-puertas-ventanas/dp/B07797SKPP/ref=sr_1_8?__mk_es_ES=ÅMÅŽÕÑ&crid=9B62FPY2N531&keywords=manilla+puerta+exterior&qid=1582643149&sprefix=manilla+puerta,aps,215&sr=8-8