I know many Spyder owners use Ram mounts to secure their equipment
This information was posted to me by a UK Supplier - Not sure if it's available on your side of the pond, But it may well be worth
investigating the part no maybe just the one used by the UK Supplier, So you may need to contact your usual Ram supplier for details
If you use Ram Mounts, then you need this simple, cheap effective locking gizmo!
RAM Anti-Tamper
If you use RAM parts, you need this! Prevent easy removal of your Ram secured items using this fantastic (And Cheap!) mod from RAM:-)
The RAP-S-KNOB3 consists of a 1/4"-20 female threaded security knob and key knob. The RAP-S-KNOB3 replaces all knobs on 1" diameter B size arms and mounts. It offers the ideal amount of leverage to properly tighten your mount to prevent slippage in heavy chop or in extreme vibration environments. With an emphasis on aesthetics and function, the RAP-S-KNOB3 is low in profile and only adds a small amount of additional bulk to your system when compared to the standard knob included. At a fraction of the cost of currently available keyed locking knobs, the additional peace of mind and tamper resistance comes at a very affordable price. The RAP-S-KNOB3 is the perfect accessory for keeping your mounted electronic device safe from theft and tampering.