I'm not prepared to make these plungers for you guys, sorry.

Are you able to upload your design files so others can print them?

I put all 4 files here:
http://www.thingiverse.com/thing:1302142/#files

There is a funnel and plunger for both Major and Super Jolly models.

Use at your own risk. I am not responsible for anything that happens in their use. Make sure that your print is made of a strong material, as the pieces are thin. I use ABS.

Thanks! The popcorning of the Major I now own is making me crazy, the throat is straight so my rolledup plastic film 'hopper' does not work well. This looks great!

I have made an additional adjustment to my single dosing tool, I have added a stopping bar through the neck of the piston so it stops at 1-2mm above the lower burr hold down nut. I have tested it a couple times, it works perfectly now.

If I was to machine this piece again, I would intergrade a stopping shoulder into the design. This was a quick and easy fix.