A good trick to improve the Spark Lite's grip is to put a chisel tip in your soldering iron, then CAREFULLY melt VERY SHALLOW horizontal grooves on the fore & aft grip surfaces. Use common sense and don't make the grooves too deep. It's not rocket surgery.

I did this on some 'Light My Fire' firesteels and strikers with the plastic grips and it works great; the improvement with wet/cold fingers is substantial. I will try to post a pic later.