My church just purchased an Altspot from a local theater. It is in fair to good condition but I would like to tear it down some and clean it up. Some of these questions my not be able to be answered but that's ok. 1. How do I bench test the follow spot? 2. Is graphite lube still ok for the iris? 3. The glass in front of the iris rattles when the spot is moved from level, is this normal? 4. How are the gels normally held on? I see plenty of masking tape but no brackets. I also see reusable fasteners were used. 5. Speaking of masking tape there is at least some on the top lid. Can I use something like GOO-Gone for this? 6. The glass is really dusty/dirty. What can I safely use to clean this? 7. The metal itself is pretty dusty/dirt. What can I safely use to clean this? 8. When I reposition the light it kinda bounces even though the clamps are tight. Is this normal? 9. It makes a vibrating/buzz noise that I'm assuming is due to normal wear and tear. Does anybody know what the usual suspects would be? I think that's all for now. Thank you.