The tug release is a 'stud' bolt from an old 1978 Goldwing Vetter fairing. These were decorative addons. They were stainless steel and yes, that also look like a spinner! So, a bolt comes into the center from the bottom into a threaded area in the middle of the cone. The cone itself was hollow. I just cut through the side into the hollow area and then using a bit of brass tubing, made a channel for the control rod. I then filled the hollow area with epoxy. At this point I cut my slot again to get through the brass tubing and to clean out any extra epoxy. Then, I did some clean up and polishing around the edges with a file and sandpaper to make sure I wouldn't fray the tug line. There is a servo under this which simply moves the control rod up or down a bit... which is the release for the tug line. Basically, this was a look around in the 'what you have on hand' to make something. I really didn't think about it looking like a spinner until after it was done. It draws a fair amount of attention simply because it looks like a spinner.

As for the location of the release, this is as close to the suggested location as I could do on the Decathlon. The idea is to put it on top as close to or slightly rearward of the CoG. On real tugs, they are on the tail, but on models the glider can have total control over your tail... glider goes left, you turn right, glider goes up, you go down. Underneath... glider goes up.. you go down. On top... glider goes up all is good... glider goes down, you go up... still not so bad. The basic idea is the glider pilot is supposed to keep their model level and above you. As gliders generally climb faster than a plane, there is a normal tendency for them to rise off the ground and be above you. So mostly the glider pilot's job is to keep their glider level. You'll pull them in the direction you want them to go. The glider pilot of course should be prepared to keep the model slightly above you, as you do not want the tow cable to be pulling down on your tailfeathers... unless you have a very big engine capable of vertical while pulling a glider! Still this is just things going bad no matter what.

Both the glider and the tug should have a release. As soon as either pilot sees something going wrong, they should cut loose. Once it starts going wrong, it can go wrong in a hurry. Also, when bringing the tug back for a landing, in some situations you may need to be concerned about snagging the tow cable. These are normally about 100 to 120 feet long. Unless you have pristine field conditions... a huge landing area with no potential snags on the ground (tress, shrubs, fences, stobs, other aircraft, whatever), it's a best idea to do a fly by and drop the tug line and then come back around for the landing.

So, unfortunately I can't point you to where you might be able to find one of the 'studs' that I used for a tug release and the release position is a good one for the Decathlon. I have not done a tow with mine yet... Just did this from reading online and some tows with a Telemaster in the past.