Did the switch o-ring mod to my four KR1AA lights and I am very pleased with the results. It feels almost exactly like my TS10 light. Nice firm tactile click and sounds like a clicky. Much improved. I have a Harbor Freight kit I bought for like $10 I think and used o-ring 009 that is ID 7/32 OD 11/32 1/16 thick. On one or two of my switches I had to fiddle with it a bit to settle in and get the retaining ring to fully secure but the end result is much much better.
