Nice LN-5000 UL3 BT Instructions And Warnings For Installation And Use page 45

c- Before installing the Biometric Lock on the door, unscrew and remove the batteries
cover sliding it.
d- Remove the internal mounting plate on the inside lock interior part, unscrewing the 3
internal screws.
e- If the door thickness is higher than 16,5" (42mm), it will be necessary insert the provided
spring, according the image below.
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English - 45 45