Servos for Sunday Alpha 50

Old and heavy but reliable servos are going to be invited for YOSHIOKA Sunday Alpha 50, that had been used for tens years of period 30 years ago, in spite of old controlling software, just an analogue, plastic geared and core less motor. Included one S9001 was modified by replacing lower supporting plane bearing into a ball bearing.
As for wing servos, it's airfoil thickness accepts normal height S9101, air break setting requires independent servo right and left promptly.
Bitter experiences the other day forced me to establish the principle, avoid any vulnerability, stout construction is the first, only a reliable hard wear should be invited, the best consideration should be done before an innovative structure is adopted.