I am reworking my 1985 GW Interstate which has “sat” for 15 years. I am overhauling the rear air shocks. I have watched several videos on this activity and removed the 1st shock from the bike. The dust boot came off easily because it was brittle and broke apart. The first step in the videos is to remove the snap ring. My shock has a hard rubber piece above the snap ring which I can view below this hard rubber part. I haven’t been able to finesse this part out but can see the snap ring below it. This hard rubber part does not appear in the shock parts blow up. I’m on the verge of cutting this part out using a dermal tool but decided it was time for some help. HELP, how do I remove this hard rubber part to get to the snap ring? I will attach a picture. The shock is a SHOWA MG9-771.