The Birdsboro Buchanan Jaw Crusher was redesigned by P.R. Engineering Limited to accomodate fabricated design versus the old casting type of crusher. This over the years has proven the true strength in design that is required when a tough, hard and/or abrasive crushing is the makeup of your rock. The fact that a double toggle (blake type) crusher is the proper application when you don't have the soft material or don't require portability, your liner changes and downtime is greatly reduced due to the fact that the rubbing and scrubbing motion that a single toggle crusher offers is not a factor. Some operators when selecting a crusher may not be aware of the fact that rubbing and scrubbing in the crusher chamber is what leads to excessive premature wear on their manganese. Impact is what hardens manganese and this is the motion a double toggle crusher offers.