With Enzo, Hirata-san and Fabian.

Today:

• Fabian debugged the broken TM H2 connection and found it was due to a faulty feedthrough adapter.
• Fabian measured the coil resistances at the rack - H1: 25.3 Ω; H2: 26.3Ω; H3: 26.3 Ω; H4: 25.9 Ω.
• We connected the SRM_IP stepper to network and DC power and checked that it showed up on the network. We still need one more long DC cable to replace the one borrowed for SRM_GAS from SR3. 
• We replaced the F1-type CuBe auxiliary spring with an F2 (serial 1804-1-2). Initially we tried it at the higher of the tow levels, but it was still too strong (3 kg on the keystone plus 1 Promec on the SF -> 8 mm), so we lowered it and got 3 kg + 1 Promec -> 11.1 mm and a frequency of 10/17.9 = 0.56 Hz.
• We decided on a reserve of 1000 g for a F0 yaw stepper and 200 g for cables, so we wanted to put 3000+445-1200 = 2245 g on the SF. We found a combination that gave 2316 g and attached it. We also set aside 531 of extra ballast in case the F0 yaw stepper comes in at rather less than 1 kg.
• While we had things locked for adding mass to the SF, we measured the other bounce frequencies: BF = 0.45 Hz, SF = 0.38 Hz.
• We noticed the SF was low by about 2000 µm and realized that of course this from the extra TM OSEM cables. We removed 223 g of weights from the BF and the SF came to about -70 µm. We then adjusted the manual sliding masses on the BF to restore pitch/roll balance. By the end of the day, we had all the IM OSEMs not perfectly centered but well on-scale.