previously located at SlimeKnights/TinkersConstruct#130
reported by @pacak
Steps to reproduce:

1. put drawbridge
2. fill it with at least two mining wells
3. place a lever
4. switch lever on - drawbridge expands
5. switch lever off - drawbridge stays the same

More info: http://www.reddit.com/r/feedthebeast/comments/1l02jt/using_the_mffs_flying_engine_mining_wells_and/

Used versions:
TConstruct_1.6.2_1.4.3.jar
buildcraft-A-4.0.1.jar

Fixed in the current version.