Video: https://www.youtube.com/watch?v=lDAyFK5WpYY
1.8 threadstone takes on a slightly different flavor than in 1.12. Although many of the same things still apply, there are enough differences to make things interesting (in my humble opinion!).
This document is split into three main sections. The first describes some of the differences in the theory between 1.8 and 1.12, and the second details some of the practical considerations in building actual setups (for obtaining an async repeater line and a falling nether portal). It ends with some notes on remaining problems and future work.
Code references come from here: http://www.modcoderpack.com/