Putting new brakes on the Rangertrail trailer (1988 model) and installing the above. I have read the instructions and it says blue ring should move 1/8” when grease is full. On the hub below, it looks like more than 1/8” to me and it is not supposed to be able to be pushed in, but I can. On the next hub it doesn’t look like 1/8” and it can’t be pushed in. Anyone use Dexter trailer buddy’s before that can tell me what I am doing wrong? Thanks