Good tool to check the actual ball link length.Super Teile, sehr zu empfehlen.Great idea, well made and nice price. These are really handy not just for Heli's but I use them when building car kits also. Nice one HK!!Overall very useful items, but one set received were poorly milled. The slot was not perpendicular to the ball join pillar leading to an inaccurate measurement. Easily rectified with a fine flat file. Still worth 5*Good quality, good price. My claim be.Sokkal 450 helicopters with faster and more accurate to work with.This tool rocks and is one of th emost valuable in my collection. I have 2 HK450Pro and set both of them using this tool and a swash leveller. The difference in flight has to be seen to be believed. Both helis will hover soo stable compared to setup without and require very minimal trimming.First: my gauges did not include the screws to attach to the calipers - not a big deal but it would have been nice not to have to go digging in my parts bin before I could use the tool.
Second: this tool is so easy to use and accurate that I will happily overlook the missing screws and give it five crowns anyway.
Zero the calipers, move them to the desired measurement and lock them in. Attach the gauges to the calipers and adjust your links so you can feel no rocking motion. Spot-on within half a turn! Easy, precise and accurately reproducible for each link.verry good item to have in tool box when setting up head on heli as when using this and pitch gauge you wont have any blades thats out of track when you take offinstalled these on my calipers.. they are't so small. very usefull..i use it on my trex 450 and 600 ball links.. i didnt try it on a 250 size yet..Interesante producto, sirve para poder ajustar al milmetro la distancia de las varillas de reenvios de nuestros helis.