Hi Jason, you can try the below tackle shops when in HK.
1) Po Kee - 1st Floor, 6 Hillier Street, Sheung Wan (nothing to shout about but it's a decent tackle store. apparently, it is the oldest one in HK)
2) Hong Kong Fishing Tackle Co - 1/F Fullagar Industrial Building, 234 Aberdeen Main Rd, Aberdeen
3) Triton Fishing Equipment - 4 outlets they have (If I am right, Triton's the only one carrying a pretty wide spread of major and up-market brands)
a) Shop B, G/F., No. 4 Ferry Street, Jordan, Kowloon.Tel: (852) 2388-7229 Mon~Sat: 11:30a.m.~08:30p.m
b) 1/F., Tak Wah Mansion, No. 290~296 Hennessy Road, Wan Chai, Hong Kong Tel: (852) 2866-8551 Mon~Sat: 11:30a.m.~08:30p.m
c) 1/F., Fok On Court, No. 100-108 Ma Tau Chung Road, To Kwa Wan, Kowloon Tel: (852) 2714-6262 Mon~Sat: 11:30a.m.~08:30p.m
d) Cockloft, Shop 1-2, Tsuen Lok Building, No. 13-17 Tsuen Lok Street, Tsuen Wan, New Territories Tel: (852) 2615-2628 Mon~Sat: 11:30a.m.~08:30p.m
I'm pretty sure those are not the only ones available in HK (just that I visited them when I was last there).
Good luck!
Cheers
Rob