Matt, as you know from the Syssa 180 discussion I will soon be making one of these mounts. Smaller diameter and only 3 stand-offs, so I am assuming the dimensions will be scaled down a bit. What is the outside diameter that you came up with for your Syssa 30cc engine mount, and what is the width of the balsa spacer rings (compared with the 0.60" for the ZDZ 40 spacer rings)?

I have read through this thread about a dozen times and think I understand the process, but I have a couple of questions for clarification:

I did not read (or perhaps I missed) earlier in your thread the step about cutting the ply rings with a band saw and then sanding smooth. What is done to the sanded balsa faces to make them durable?... hardened with thin CA, or epoxy, or some other covering?

Regarding the rubber bands... Okay, is this correct?... There are 2 - one somewhat narrower one that fits into the recess between the front and back ply plates, and then another that overlaps the ply plates (actually this one is obvious).

Also, not mentioned specifically but it seems obvious that one must be careful to line up the holes carefully for the firewall access bolts.

Thanks very much. I will post photos of my progress in the next couple of weeks. I don't have a well-equipped shop but I have viable work-arounds for accurate execution of all the steps.

More questions to follow, I'm sure!!