The O-Rings are all the same size. More O-Rings extend weight further out on barrel.Hector sent me one to test on my Model 48 and I returned it to him.
Only shooting off hand - I was not able to shoot accurately enough to be able to test it.
What a JIP ..........
My 20 caliber D54 built by Hector-Medina was provided with his harmonic tuner(HT). I've used the 20 caliber successfully for over two years without monkeying with the tuner. A few months ago Nitrocrushr posted his results with his D56TH that were spectacular. That led me back to the posts that Hector-Medina made during his development of the Harmonic Tuner.Since I can't ever leave well enough alone, I just have to tinker with the HT on my 20 caliber and will follow up with tinkering on my .177 D54 that I purchased the Diana HPM (high performance muzzle weight ) for. So here we go!!! Since my outdoor range is a minimum 50yarder and my vision makes shooting in the sunshine problematic, I am starting at the 50' 17yd indoor range that is readily available. I can shoot from inside my kitchen to about 30yds and will do that soon. First experiment - establish a base line for the current set-up.I shot 5 consecutive 10 shot groups under the same conditions before making ANY modifications to the setup. They are first target shown below. Since the rifle was zeroed for 50yds from my last outdoor foray the groups center about 0.4" high at 12 o'clock from the POA. This is nice as I didn't shoot my POA out. Average group size measured as a rectangle: 0.452" High x 0.570" wide. The width is probably a bit wider than it should be. The range has substantial ventilation for gun smoke and the targets are hanging from a carrier that flexes. I try to wait until the target quits swaying but the difference is pretty small. Second experiment: Change the number of O-rings to see what impact they ave on accuracy. I started with 9, then 7, then 5, then 3 and finally 1 again. All 10 shot groups. I shot 3 groups with 1 o-ring to compare to the baseline. Average was 0.44" High x 0.57"wide. Statistically identical to the baseline. HOWEVER: the point of impact moved sustantially to about 1" at 10:30 o'clock. 9 o-rings group 0.45"H x 0.77"W (note the table on the target is backwards - dyslexia??) POI 0.55"at 10:30o'clock. 7 o-rings group 0.45H x .42"W POI 0.42" at 10:30o'clock.5 o-rings group 0.42"H x 0.52"W. POI 0.25" at 12 0'clock. 3 o-rings group 0.50"H x 52"W. POI 0.40" at 10:30 o'clock.I suspect the change in POI from the 12 O'clock position was my not paying attention to whether I put the stabilizer in exactly the same alignment on the barrel. Next series I will take that into account. Preliminary results: At this short range the accuracy was little different except in the 9 o-ring group that may be statistically different.Positioning of the stabilizer on the barrel and may have some impact on POI that would be eliminated in the zeroing process. SORRY THAT PICTURES ARE UPSIDE-DOWN. I WISH I COULD FIGURE OUT WHY MOST OF MINE END UP THAT WAY WHEN POSTEDD!!!
Quote from: SpiralGroove on October 01, 2020, 07:24:15 PMWhat a JIP .......... Sorry, Non-native English speaker here, exactly what is JIP?Apologies, but searches in Google lead to various possibilities.TIA and TLA's rule!;-)HM
I should have said - I did not test it because my results would have been inconclusive since I could not shoot accurately enough to provide any useful data.
Hector,Would just plain o-rings be of any help in reducing "harmonic distortion"-maybe not the right term, but I like the sound of it. Or do the o-rings need to to be in contact with something to reduce vibration?-Y