[PS -- thanks, Jane Eborall for introducing me to lock chains. I'd never neard of them before your hippo TIAS]
Here goes (oh, and keep in mind, nobody's test-tatted this thing):
Materials:
2 colors size 80 thread
Two shuttles
Techniques:
Split Ring
Self-Closing Mock Ring
Lock Join
Abbreviations:
- or p = picot
— = double-length picot
—— = quadruple-length picot
lj = lock join
RW = reverse work
SCMR = self-closing mock ring
Sh = shuttle
SR = split ring
vsp = very small picot
Begin at SR A: [Sh 1] 4-4——4 / [Sh 2] vsp 5-5 (the vsp is used attach the final lock chain)
*Lock Chain : 4-3-3-3-3-3
Inner Ring B : [color 2] 6 (+) 6-6 (on subsequent Rings “B” join to free p of previous ring B, shared join with lock chain between Rings H and I)
Lock Chain : 3+3+3+3+3+4
SR C : 4+4-4 / 5 — 5 (to quad-length p of Ring A, after twisting the p 3 times)
Lock Chain: 6
SR D: 4-4-3 / 5
Chain: 6-6 RW
Ring E : 6+3-6 (to free p of Ring “C”) RW
Chain : 6-6 RW
SCMR F: 8+4 (Ring f 8-8) 8 (to free p of Ring “E”) RW
Chain : 6-6 RW
Ring G : 6+3-6 (to free p of Ring f – the ring thrown off the SCMR) RW
Chain : 2-2
Ring H : 6+8-4 (to free p of Ring G)
Chain : 2-2 lj to free p of Ring H
Lock Chain : 6 (lj to free p of Ring B) 6 (place size 30 thread or fine paperclip to create a joining space for Ring I) and continue with
Chain : 2+2 (join to free p on the Chain between Ring H and the Lock Chain) RW
Ring I : 4+8-6 (join to space created by thread or paperclip in previous chain) RW
Chain: 2+2 (to free p on Chain between Rings G and H) RW
Ring J : 6+3-6 (to free p of Ring I)
Chain : 6+6 (to free p of Chain between Rings F and G) RW
SCMR K: 8 (Ring k 8+8 [to free p of Ring J])4-8 RW
Chain : 6+6 (to free p of Chain between Rings E and F) RW
Ring L : 6+3—6 (to free p of Ring K) RW
Chain : 6+6 (to free p of chain between SR D and Ring E)
SR M : 3+4-4 / 5 (to free p of SR D)
Lock Chain: 6†
SR (A) : 4-4——4 / 5 (+) 5 (to free double-length p of Ring L)**
Repeat from * to ** 4 times and from * to † once; end with lj to vsp at beginning. Cut and tie ends, hide with magic threads