The pulleys in my diagram will have no effect on the weight because they are in a continuous train. I tested this also just to make sure with some scales that I stood on. Whatever weight was on the end of the pulleys was the weight difference that showed up on the scales.

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Yes, I would like to see these systems as well, I'm working crosses a lot more and I rarely have a spotter, I was thinking about making a simple but cheesy pulley system.

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the reason i dont want to add weight is because i weigh 160 and the weakest point on my system has a safe working load of 125 (the pulley)

Pulley ringsplint

someone who is good with physics or pulley mechanics know a way to decrease my assisted leverage without increasing any weight?

Here's a couple of sketches of how I set up my simple pulley system. My rings hang from the rafters in my garage so it's easy to rig up something like this. You just use the rings as normal and whatever weight you add to the pulley system makes you lighter by that exact amount. I tested it by standing on bathroom scales and it's very precise. If you add 20lbs to the pulleys then you weigh 20lbs less so for static holds you can gauge improvements by very precise amounts. I use a thin nylon cord to run through the pulleys and it has a breaking strain of around 300lbs and as I only use around 20lbs on the pulleys it's more than strong enough. For the pulleys I use solid metal ones which were very cheap on ebay. First time round I used metal pulleys that had plastic wheels but they broke after a few months of use so go fo all metal ones. I use two pulleys each side to keep the weights far enough away from me that they don't interfere with any exercises.

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This is not me, is my nephew, simply moving the strap near the elbow decreses the leverage. In that way i can do a cross pull. Of course if you put it as in the video (about elbow height) you loose the elbow training but you can gradually move the straps far from the elbows. Although the pressure on the forearm is very intense and cuts the pass of blood easily, so is better to put a protection between the straps and the forearm.

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On the diagram, you use 2 wheel pulleys. The more pulleys you use, the less the weigh will weigh because it will have more resistance. Is there any reason you would not just use one? perhaps not enough room in the space? I would figure one pulley in the center of where 2 are placed in the diagram would be perfect and you still would not interact with the weights. I am not sure how much of a difference, but I am pretty sure the weight will feel different.

I don't have a fancy belt/harness. All I did was make 2 loops from 2" nylon webbing and each loop is big enough to go over one leg. Tie one loop to the end of one cord and the other loop to the other cord. See second sketch. It's no good if you want to spin upside down, for that you would need a special harness belt but for crosses, dips, planches etc it works fine.

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that diagram helps i'll try a similar that setup today, btw i use a long heavy duty velcro strap as a belt and it works pretty well

i was thinking instead of attaching the end to a belt, i'd attached each end to my arm and the closer it is to my body the easier it would be, similar to that iron cross trainer posted here a while ago.

I think what you are thinking of is where you have something called compound pulleys where they are mounted one below the other and this is different to having them set at the same height as I have. It's only the height difference that changes how they affect the weight. Look up compound pulleys on google to see what I mean.

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I made a pulley system for my rings where I wear a belt and a length of cord is attached to either side of the belt runs up through some pulleys and I just hang some weights from it. Whatevr weight I hang on it is the amount of assistance it gives me. So it can be as little as 1 lb or say 50 lbs. At the moment I can hold an iron cross static hold with 20 lbs of assistance. My bodyweight is 150 lbs so if I weighed 130 lbs I'd be able to hold the cross without any help. The pulleys are a great help and it keeps the movement feeling very natural. The pulleys also helped me work up to full bodyweight cross pullouts and bodyweight rings turned out dips.