Craftsman chainsaw wont stay running

I'm trying to build an outdoor pull up bar and I wanted to get some advice. Here is my plan. 2 - 4x6 10' or 12' posts. I originally wanted 12' but i was concerned that I may not be able to dig 4' with a post hole digger I have. So I was going to maybe go with 10' and dig 3'. But then it is at 7 feet, which is lower than I wanted but should be acceptable. Put some rocks in bottom of hole and fill it with quick crete 1 - 1" x60" or 72" galvanized steel bar My concern is how can I put the bar up without it spinning? I was thinking a flange, but it would think it would spin. SHould I drill a hole through the posts and how should I secure them. Should I use a hole saw or a drill bit? Thanks

Hello all, I am currently working for an NGO in Mongolia and getting local herder people to measure the depth to water in their shallow wells (<5m) on a regular basis. We are in the design phase at the moment and trying to come up with a simple tool to meausre the depth to water, however we are slightly stuck with the design and i have come here in the hope someone on these forums might be able to help us a little? What we were thinking is a simple tape measure (5m) that has a weight at the end to keep the tape straight and vertical but to also act as a float, so that when they reach the water the line will go slack because the weight/float will be supported by weight of the water, and then they can pull the tape tort to get then get depth of water and read it from the tape measure. However it is good in principle, but we are struggling to find a weight that is heavy enough that will also work as a float, and then also how to attach the weight to the end of the tape measure. The only way we have found so far is with the tape end of a surveyors tape measure, so we could perhaps clip something on... however lots of them are flimsy and break easily, and we have not found any that come only in 5 or 10m length. Also, we find when we have attached a weight, it does not take long for the end of the tape to fray and end up breaking off the clip at the end of the tape measure. We are really stuck, so if you have any advice on what we could do, or any products you think that we could buy and then get shipped over here would be greatly appreciated. Many thanks, Luke