Tantrasara (Krishnananda) 2.p213

2.p213

anuktakalpe yantrantu likhetpadmaṃ dalāṣṭakam .
ṣaṭkoṇakarṇikaṃ tatra vedadvāropaśobhitam .. 90 ..
tataḥ punardhyātvā dīkṣāpaddhatyuktakrameṇa āvāhanādi
prāṇapratiṣṭhāntaṃ karma kuryat .. 91 ..

“When a rite is not specified, one should draw a yantra as an eight-petalled lotus, / having a six-cornered pericarp there, adorned with four doors.” (90) / Then, having meditated again, in the order stated in the initiation manual, one should perform the rite beginning with invocation and ending with the installation of the vital breath. (91)