Have you got this type of dropout?
http://www.chainreactioncycles.com/Mode ... elID=71924
If so, replace the cap head and serated washer with a larger diameter button head bolt and an antishake washer (not as agressive as the facory one), this spreads the clamp load over a greater area. Not had any problems with this set-up slipping on my Explosif.
Let me know if you need pics of the bolts / washers.
http://www.chainreactioncycles.com/Mode ... elID=71924
If so, replace the cap head and serated washer with a larger diameter button head bolt and an antishake washer (not as agressive as the facory one), this spreads the clamp load over a greater area. Not had any problems with this set-up slipping on my Explosif.
Let me know if you need pics of the bolts / washers.