ok, i dealt with the same issue. here is the problem.... when you reduce the size of the cylinder or whatever you use to make the bars, the reduction makes the block or whatever shape too small to compile. so the level builder either re-compiles or removes it. so your best bet is to build your bars in MED. when a block is too narrow, it is either re-compiled or removed as well, so be careful with the build. good luck.
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