block and tackle rod balance

Thanks for posting. These old crossbow balances are no longer made, but they can be replaced with our Series 795 Channel Balance. The video below explains to you how to do this. 

I'm afraid I can't answer that question for you. The only way to decide between the weight options for the S795-34 is to weigh your sash on a scale and refer to the chart we show on its store page. You can see how this is done in the video I shared previously.