I got some of these last time around. If you use them close together, they are great at holding leather well as the glue dries and leave minimal marking when they form. I find them easy to affix - no screw tightening, especially when putting waste underneath to stop all marks. Cheap as chips so nothing to lose.
http://uk.aldi.com/special_buys/productnl_405.html
http://uk.aldi.com/special_buys/productnl_405.html