hello, i would like to be able to build an adjustable speed bag platform because the ones for sale cost way too much. ive been visiting a speed bag forum where alot of other people build there own platforms but usually they are wood, and any metal ones they build dont adjust, so i know there are others on that board who would appreciate any answers to my q's. i would like it to look like any of these http://www.combatsports.com/detailpo...AGES/mrsap.jpg
in the first link and the first pic of the second link....is there a special name that you would call steel tubing when it has that "sliding sleeve" around? is there any place i can buy a pre drilled rail (seems like it would be hard to get all the holes perfect on both sides) and a prewelded pop pin "sleeve"? ive searched for a couple days now and cant find anything online, the only thing i found out was the pins are called pop pins. also what would the remaining "slide mounts" on the second page be known as? thanks for nay help!!!