You can see pictures of the inside of the PRC-47 module on my web page under the PRC-47 variable tune mod: Note the red dust that I removed. And yes the "red dust" is part of the shock absorbing material that has deteriorated with age. http://solo11.abac.com/zorroab1/prc-47%20Frequency.htm The T.O. for set can be found at https://www.logsa.army.mil/etms/data/A/015740.pdf