I did use the wood dowels supplied with the kit, and didn't have a problem with elevator flutter. Areyou sure it is elevator flutter and the total stab isn't fluttering... since stab flutter seems to be a common problem with this aircraft. Especially on hot days when the fiberglass towards the rear of the fuselage becomes more flexible.
Some how I got horizontal stabilizer instead of vertical out of the previous posts, I don't have either problem as I haven't put the thing together yet. I'm just trying to "get the facts" before I do, so I don't have the problems that have surfaced. Especially the fatal ones
Some where towards the begining of the thread Richard L said he had flown his "Tons of times in the past couple of years" and reported no problems, till later. Does it weaken over time, I wonder. Would filling it with expanding foam would do any good or just add too much weight? Seems like it might stiffen it up.