Yeah, the heck with that high dollar device.
Looks like you could use a big piece of brass if you happen to do hand-loads for your anti-aircraft guns.
The HS tubing works. I like to use surgical tubing cut into tiny bands, because I can also use it to build skirts. I put the hook through the tubing perpendicular to the "senko type"
and it is great.
As Period mentioned, the barrel of a marker works well if you just have to have the O rings.