Your crossbow is probably the hybrid that was produced between the joint venture between Proline and Winchester(as in guns)..All of the real Proline crossbows were camo-wood-laminate, when Winchester signed on they produced a metal crossbow which is now the Darton-Great Lakes crossbow with minor changes..Darton bought Proline mostly because the Proline Mountain bow(compound)was credited with the largest non-typical whitetailkilled with a bow..Proline produced both compound and crossbows marketed under Proline and Winchester brands with minor changes between the lines..

To answer your question, call Great Lakes and ask to speak to their chief engineer, he should be able to answer all of your questions..