Back when big shots cost probably half of what they are now I cheaped out and brazed some 5/16 steel rod onto a garage door opener steel tube, add one broom handle extension custom fit, a little handiwork making a leather pouch with bands, steal Moss's archery trigger and Bob's your uncle many years later, I just keep replacing the latex tubing as it dies. Gives the option of changing tubing force. I just switched out Theraband for SKLZ tubing. Have SKLZ tubing on my lightweight version. Was going to make a portable folding head like the one Sherril squashed but didn't get a Round Tuit.
Yeah, that was my initial reactions right after I found out that it has been stolen from my magic van . " okay ! This is nothing ! I'll just gonna make one myself ! " Like that.
All I need is a couple of two piece of steel dowels , few inches pipe , an used dry cleaners coat hanger wires and torch that's it.

or I would just weld them together properly.
I'm sure brazing would do the job for meantime. however ,
remember that this kind of slingshot apparatus requires applying repeating stresses then release of forces alternatively . That means it's gonna creates metal fatigues / material fatigues soon or later in time we just don't know when that's gonna all broke loose . Therefore it is better off to weld them together . Just to be safe and sure . It's way better than sorry . because welding has much stronger bonds than just brazing two piece togather.
Advantages of Welding :
Produces stronger joints than brazing or soldering.
It looks similar to most of people but one is applying a bond between the two objects. Like a putting a glue on between two items and adhering two togather . . Welding is like fusing two pieces of metal with a glue but melting it's material mixing it with each others to create much stronger bonds together. Actually That's a huge differences between the two .
Also , Big shot throw weight launcher requires climber to aim then shoot out it's projectile called Throw bag. That means shooter's eyes and face would be directly in lines with face , pouch , projectile , rubber/ silicone bands, to the sling shot arms in straight line some times . When you applied pulling force and maintaining it's position for a while the bands are pulling its forks and applying stress and forces of maximum strength . What if after repeated use with stresses and release movements created metal fatigues in those most stressed area of the forks then snap back to your face or hands ? It would give possibly very devastating damages to the users , obviously. Even if you were wearing safety glasses and visorers over your face. C'mon noone wants that things snap back at ya face. LoL I remember that Guy who created Titan submersible ship proudly saying this sub isn't a ordinary submersible... this is a innovation of bra bra bra ... something like that . But completely forgot such a fundamental rules of material's characteristics... and off he went including other innocent victims who believed on him.
Well, either way , I would need adequate tools and materials and place to make one. That requires time , some funds and my labor time , fuels to visit them , communication skills to convince my ex coworkers and a case of beers. LoL
Then I realized that when all that troubles I have to go thru to make one but instead, Isnt it much better to ask someone who has one already ? So I decided to just ask someone from this Tree bay for help.
Sure enough , It turns out to be just Great !
People on this forum are very good people . No natural born lame jerks are around here LoL
So , after I posted my request I wasn't expecting anything at all but
@Shadowscape reached out to me right away after Ive posted my post .
He says he's got one and he will send it to me like " right away right now " !! Then He really send me a package like same day with blistering fast shipping speed just as he said & he did just as he would .
I've got the package and item . I've inspected item through out and found out that there are few nicks and petina type rust and the rubber bands are showing some aging .I was sure about I can use two or three times with current condition with no issues . Anyway I've wiped off very light rust with some household oil like 123 to clean it off then I found out that heads metal part is completely intact just like brand new . only thing is just to replace bands. I do have a replacement bands already so I just installed it and ta-da ! It's brand new perfect condition!
So now? I'm good to go !
Yeahhhhh ....
This is the beauty of Treebay !
This is the power of people .
Treebay everyone !!
Spread your love and let's help & share each others !
So , When you have still good unused or used gears and tools you can sell them or barter them , exchange them ! Why don't we !?
That's what this Treebay is all about !