SELDEN Mast Mounting Plate / 100 x 145 mm

The quality is excellent, but SVB only offers one angle when there are two. (The choice is even more limited for winch plates.) It is therefore advisable to call SVB who will be able to provide you with the exact element you need (5 or 15 degree angle)

The quality is excellent, but the holes are slightly too small for the 6.4 mm rivets provided for fixing to the mast. For the blogger attachment, it is essential to provide for tapping the plate with a machine tap allowing tapping of blind holes, because screws will necessarily fall on the vertical ribs, which must not be drilled through. (As little as possible, in fact!) The holes falling between the ribs can pass through but will have to be tapped anyway since it is impossible to use nuts between the vertical ribs, unless the blocker is made unremovable. If you drill with a hand drill, drill a little smaller than the standard, (for example 4 instead of 4.2 for M5 screws), because the metal is soft and the hole will tend to widen. A drill press is preferable, but you will have to compensate for the angle of the plate.

For a triple Spinlock blocker, two screws fall between the ribs, and the other four on it. It is therefore impossible to use nuts. Recessed nuts are possible for the two middle holes because the blocker has a reinforcement for the protruding collar, but not for the other side holes, because of the ribs of the plate.

Provide a large rivet pliers because standard pliers do not take 6.4 rivets.