Daniel Wilmers, who runs the Flyfishing School Wilmers out of Ramsdorf in Germany, has created a handy tool with which you can splice dyneema tying thread in seconds.
You can find the tool here. The tool will cost you € 17,95 from the shop on the website.
Daniel Wilmers
Fishing Guide
Revert’s Esch 7
46342 Ramsdorf
Germany
Email: danielwilmers@web.de
Website: www.fliegenfischerschule-wilmers.de