Declension table of yantraka

Neuter	Singular	Dual	Plural
Nominative	yantrakam	yantrake	yantrakāṇi
Vocative	yantraka	yantrake	yantrakāṇi
Accusative	yantrakam	yantrake	yantrakāṇi
Instrumental	yantrakeṇa	yantrakābhyām	yantrakaiḥ
Dative	yantrakāya	yantrakābhyām	yantrakebhyaḥ
Ablative	yantrakāt	yantrakābhyām	yantrakebhyaḥ
Genitive	yantrakasya	yantrakayoḥ	yantrakāṇām
Locative	yantrake	yantrakayoḥ	yantrakeṣu

Compound yantraka -

Adverb -yantrakam -yantrakāt