Allen head cap screws are a lot better for a lot of use. Slotted head screws are more for tighten it once and leave it alone, i.e. cheap. Just goes to show the quality of the loader. BTW I also own one.
.357 Taurus Gaucho, .22 Heritage RR, 2-Pietta 1858 .44 NMA Remingtons, Euroarms & ASM .36 1851 Navies, .31 Uberti Baby Dragoon, 12 ga H&R Topper, 16 Ga Western Field, .43 Spanish Remington Rolling Block, .44 ASM Colt Walker, High Point C9 9mm, Winchester 1906 .22, Rossi 62 .22 rifle, Uberti 1860 and IJ .32 S&W BreakTop, .36 Euroarms 1858, .32 S&W long H&R