Raymarine RD418HD User Manual page 19

3. Lightly coat the threads of the four mounting bolts, with the
Denso Paste provided.
4. Ensuring that the bolts do not enter the antenna base more than
25 mm (1 inch), secure the antenna with the 4 bolts flat washers
and spring washers provided, as illustrated. If necessary, use
appropriate shims or extra washers to limit the length of bolt
entering the antenna base.
Installation
5. Tighten the bolts to a torque of 20 Nm (177 lbf/inch).
Connecting
When connecting your HD Digital Radome Antenna, use the
instructions given here and also refer to the installation instructions
for the multi-function display (MFD) to which you are connecting.
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