SEMROC Centering Rings

[Green Jello]

I just received a shipment from SEMROC. I needed some centering rings to make a 29mm motor mount in a #175 (1.22" OD) body tube. This is the set I ordered:

http://www.semroc.com/Store/scripts/...idproduct=1444

And this is how it looks:



It's pretty clear how it's to be assembled, but is this how all of SEMROC's centering rings are? Anyone have any feedback or tips on using these?

[Green Jello]

Also, as a side note I needed some thrust rings for the #115 tube:

http://www.semroc.com/Store/scripts/...?idproduct=744

And this is how they came:



I was expecting something more like:

[kruland]

The centering rings I've ordered were more what you expected with the simple annulus. The ribs seem like a nice idea to give additional gluing area and make a more rigid system. If you are doing through-the-wall find, I'd have the CR ribs tight against one side of the fins (assuming 3 fins of course).

Kevin