Recommended to properly tension drive chain between operator shaft and door shaft.
# 71β6023: for 1 inch shafts.
# 71β6125: for 1 ΒΌ inces shafts.

Recommended to properly tension drive chain between operator shaft and door shaft.
# 71β6023: for 1 inch shafts.
# 71β6125: for 1 ΒΌ inces shafts.