Does anyone know of any tools or instruments or special gear with round stubs on them to wear to hold the testes in the inguinal channel on a permanent basis.

I found that I can't.. I just can't lol but I think I get pretty close, and I look and feel smooth at the gym.
I'll have to find a link on you tube where I learned how to make my own "gaff".  The same girl was pretty helpful with voice tips/suggestions.  Anyhow, so I have my pantyhose elastic part from the top and a cut off end piece of a tube sock, the top part that goes up the leg, and you can turn it into a thong type of thingy.  Now this is where ymmv, my downstairs neighbor isn't a big dude, and I've seen noticeable shrinkage of his two kids since hrt began.
How to do it?  It shouldn't be too uncomfortable.. Once you get 'up' what you can, then tuck what you can back, and the gaff that you made will hold stuff up.  And with a less stretchy undies, you can trust the support.  I do have slippage here and there, but nothing a rr break can't fix c: 
There are other gaffs and stuff you can buy, but a pair of pantyhose and a pack of tube socks is just within my price range

Her user name is: Violete4151
Some of the few videos I've found helpful for me were from her

Only thing worked with my issues was HRT.

After some time they went up on there own and stayed there most of the time.

I never tucked so can not add more that could help somehow.

I know some girls who wares panties that are a size smaller then normal to add extra pressure to keep things in place.

Two pair of panties that were a little tight did the trick for me.

I experimented with a few things, some worked fabulously but needed periodic adjustment. I am familiar with the technique Madeline describes as well, but like Suzi, I found that tight panties work well and are stable and expeditious.

"Expeditious?"  Ellie, you are wonderful!  But when it counts 2 pair works pretty well.

Julie

 

I'm fully tucked every day, what really did the trick for me was a thong style gaff and then a pair of support panties:

http://www.thebreastformstore.com/mens-gaffs2.aspx

http://www.secretlegwear.com/products/ultra-firm-shaping-brief-77.aspx

I use the combo while biking, exercising, etc and nothing ever slips and I dare anyone to see a bulge.

Quote from: Madeline182 on August 06, 2014, 09:21:47 AM
Her user name is: Violete4151

Violet is awesome! Link for anyone interested: http://youtube.com/violet4151