I designed and machined one. It can use (2) Harmonic Stabilizers-one in each Dampener pocket or 2 Dampeners in each pocket. I found with (1) Stabilizer and (2) Dampeners in the back, it balances and absorbs great. 7.25" overall and with the single Stabilizer double Dampeners 7.5 oz. Let me know what you think. Thank for looking.