Kimchi Billiards
Has a decent selection of cues and cases, though they mainly focus on carom cues. They have a real lathe, so should be able to do work on shafts and tips.
https://www.facebook.com/kimchibilliards/timeline
KIMCHI BILLIARDS CO.LTD
B01 KI-YOUNG BLD, SEOCHO 3DONG
SEOCHO-GU
17166 SEOUL KOREA
Directions:
Go to Kyodea station line3
and then go out exit 10
go straight then you can find the ki-young building Basement 1 floor
http://map.naver.com/local/siteview.nhn?code=12128846
The definitive guide to playing pool in Seoul!