Conversation so far:
When was Pull the Thorns From Your Heart released?
Pull the Thorns from Your Heart was released on June 30, 2015.
Were there any singles released from it?
CANNOTANSWER.
Who produced it?
Pure Noise Records.
Who were the touring replacements?
guitarist Matt Smith was absent due to the birth of his first child.
Who replaced Matt Smith?
Bassist Gavin Caswell took over rhythm guitar duties live.
Were there other changes to personnel?
Zack Roach returned home for the birth of his child.

Question: Who replaced Zack Roach on the tour?
Self-contained rewrite: Who replaced Zack Roach on the tour?