Spindle Lock Nut DMI-SRC1997Spindle Lock Nut"Trick" DMI SRC1997 I SRC1997 DMI & Bulldog are at the forefront of the short track racing industry, offering reliability and performance that's second to none. You can't focus on figuring out how to go faster if you're consistently replacing parts. And we know you aren't making money dropping out of races. That's why we dot every "i" and cross every "t" to make sure our parts outperform everything else on the market.