There is a roller in the Omega D5500 or ProLab II, which enables the finer up and down movement. The rubber on the roller fails pretty early. I've seen the instruction on how to replace the roller, but I'm here stuck in removing the pin(s). With the pin of the axel, it prevents me from removing the roller assembly out and replace the rubber. How do I remove the pin? Evey by following the instruction below, the pin would be still stuck in the middle. Thx.