I can’t say enough good things about these wonderful contraptions! I found out about them via a member of the Louet David Loom group on Facebook. When I watched the video I knew I had to have them. I used them for the first time and it was the easier loom-dressing experience that I have had since I got my David III in June. I have always done exactly as Jane suggests in her classes, and it was fairly easy. But these things make it even easier!
The first item is the lease sticks holder which is moveable for beaming, and then threading.

Then…using the raddle, (it snaps right on top of the built in raddle on the David (which in my opinion is too short) and it is divided up so that for those of us that are metric-challenged, it has 4 slots/inch. I was forever trying to get my warp spread out evenly and centered. Not this time. Easy peasy.

After beaming, you simply move the lease-stick thingy down to the adjustable threading position. It is AWESOME! Anyway, I just wanted to pass this on because I love it so much!

Here is the raddle. You can see the bracket that holds the lease sticks for beaming on the right. I forgot to take pictures until I was done beaming.
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and here is the lease sticks in threading position.
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If you have questions, I am happy to answer if I can. I know they also have them for other looms, such as Schacht. And they have a demo and tutorial on the Lofty Fiber YouTube channel.

I have those for my Louet Jane. I love the lease stick holders and the adaptor for the lease sticks to be angled for the use of the raddle. For the Jane the angled piece is different than yours and the least stick holder can also be moved to the front, when finished holding lease sticks, to hold a shuttle at the beam.

I should have known someone would already have these. I love them soooo much!