I have a Markbass Little Mark 250 head which I have used several times for small shows (with a Yamaha 12" 2-way monitor but that is another story) and as a backup to my rack-mounted 1997 Ampeg B2R head. Well the Ampeg was having problems so I pressed into service the Little Mark for a smallish outdoors show (no PA support). The Little Mark did a great job, excellent tone with my Fender 4x10 (2016) and plenty of volume. But during the sound-check tune, I noticed the Little Mark was hanging over the front of the cab. I pushed it back and kept playing. I noticed on the second song it was back hanging off the front of the cab. I pushed it back but this time watched it for a bit and noticed it was moving, shaking toward the front of the cab at a fairly rapid pace. After the second song, the drummer gave me some tape (like electrical tape but not rubberized) to tape the Little Mark head to the cab. This worked but does not seem to be an elegant solution. Being how popular the ultra-light heads are these days, others must have ran into this problem before but a search did not come up with any direct reference to this problem. Does anyone have a reasonable suggestion to solving this issue?