I’d come to that fly-in with my 3-blade 182 (subject to a chat with my co-owners)
Or maybe we can do a group rebalancing session at EGKA? :)
We did this today at EGKA as discussed above.
For 2 x TB20, an excellent result. Mine went from 0.5 ips to 0.06 ips and most noticeable is a huge reduction in the instrument panel vibration. Initially we got some weird results until I suspected the hub was not properly filling with oil; cycling the prop as usual before doing the measurement (after every engine start) sorted this!
Yes, I bought a prop balancer, they give a meaningful improvement!
YAK_18_Propeller_Analysis_ms_pdf
There were persistent vibration issues with 3B props – in the TB20 context it was the Hartzell one. So I insisted on getting dynamic prop balancing done on my TB20 when it was brand new. They started with 1.5ips (which is pretty bad) and got it down to some fraction of that. It was a firm in Exeter – no doubt long gone. I handed over the bank draft for the second 50% of the payment for the plane on the return flight 
Anyone interested in getting this done – contact A_and_C.
Or, if visiting Jockistan with a capable aircraft, come to Glenswinton.
We have a couple of Dynavibe kits here. The improvement on small helicopters and Lyc 4-cylinder airplanes is well worth an hour or so of owner/mechanic time.
My Dynavibe is available to anyone who cares to visit.. it’s important to have a good sensor securing point in the front of the engine, preferably just behind the front bearing. A longer crankcase bolt sometimes helps.
Reducing down to sub 0.1ips will be noticeable, especially if the previous reading is above 0.2. My new whirlwind prop started at 0.28ips and I got it down to 0.08 with a Dynavibe classic – I need to spend some more time on it to improve this further but it’s already nice and smooth in flight.
I chatted with the designer of the Dynavibe at Aero Friedrichshafen this year and he gave me some tips, a useful one being to start with 50 grams per IPS. This got me down to a good reading on the first attempt at adding weight and only another couple of weights were required after that.
