Interior Window handle fixes for stripped splines?

[Apache13]

Hey Guys I am so tired of my stripped interior handles on my 1958 Apache over the years. The splines alwasy seem to strip off easily for either door opening or especially the window winders. They handles slip on to the splined male end coming out of the door and then you tighten up a small set screw. At one time I did drill small notch in the window regulator splines so the set screw had more grip. The aftermarket handles seem like they are made out of chromed sawdust! Has anyone come up with a good fix for this ongoing problem? Thanks much!