The document provides maintenance instructions for ISMS mounts made of 7075 T651 aluminum. It states that normally no maintenance is needed but washing with fresh water is recommended if exposed to saltwater. It provides torque specifications for tightening various screws and notes that screws are pre-waxed. It describes how to easily replace the plastic level without removing other components, taking care not to over-torque the screw. It notes that normal solvents are safe to use but acids should be avoided.

1. e-mail: ulf@spuhr.comPhone: +46 702 603344
web: www.spuhr.com
Spuhr i Dalby AB
Terminalvägen 7C
SE-246 42 Löddeköpinge
Sweden
Spuhr Ver. 1.2 / 2014-01-11
Maintenance of ISMS mounts.
The mount is made out of 7075 T651 Aluminum and is covered with a sealed hard coated finish.
Normally there is no need for maintenance, but if the system have been submerged in salt water
or spend time close to saltwater it might be a good idea to wash it off that and that is easiest done
by just using normal fresh water.
Torque
Rings screws should be torqued between 1,9-2,9 Nm (15-25 inch/lbs) depending on
scope manufacturer.
Mounting screws for base is recommended 5 Nm (45 inch/lbs).
Screws for accessories are recommended 2,8 Nm (25 inch/lbs)
All screws come waxed to make the torque more even and avoid binding. The screws can be glued if
the customer wishes, same as the scope can be glued against the rings if that is preferred, in such
case please clean both screws and holes carefully with acetone or similar solvent.
Level replacement
The level is mounted between two thin rubber washers and the level can easily be replaced.
Replacement of level is done without removing mount or scope from mount, there is no need to
check zero after replacement of level. We recommend great care when doing it as the level is made
out of plastic and can easily be destroyed if too much torque is applied on screw. Only very little
torque should be used, just enough to prevent it to rotate. M8 set screw that holds the level in place
should be fixed with Loctited and we recommend #222. Great care when cleaning threads before
gluing is recommended.
Solvents
Normal solvents as alcohol, acetone etc causes no problems on metal surfaces. Make sure to protect
the plastic level.
Acid
Acid should be avoided as it will make harm on all parts, both aluminum and steel screws.