I just got a new used Alamo SH 88 flail mower, it looks rough shape but in good working condition. I found all the obvious grease fittings, and the gear box is straight forward. I replaced 2 fittings that were missing. The question I have is, the hole in the one picture that looks like a grease fitting broke off. I tried a needle point on the grease gun but no luck. Anybody have anymore maintenance issues I should look out for, Thanks for any info 