Ventilating the Canopy (The saga continues)
The one rear vent wasn't enough. So six more vents were added to the top of the canopy. At first four, but that wasn't enough, so two more were added:
The way this was done was to first drill holes in the canopy top using a two inch hole saw. The hole was slightly enlarged using a rasp.
The idea was to then fill these holes with plastic knock-out test caps ($0.25/each at HD)"¦..
"¦"¦that were cut with groves to allow ventilation.
This was easier said than done. Here is how I did this and the difficulties I had.
First the cap was marked where the tab was on the top of the cap. I wanted to make sure this tab was in line with the saw blade so that it would be cut off. The cap was then hot glued to a piece of scrap plywood.
On the left side of the scrap plywood, ¼ inch marks were made. The saw blade has a kerf of approximately 1/8 inch, so spacing ever ¼ inch should leave approximately 1/8 inch of plastic. A piece of tape was applied to the back rest of the saw table and a reference line was applied. So now the plywood can be moved in ¼ inch increments to this reference line to make the cuts in the cap.
Now for the problems: No matter how slow, or how deep, or shallow the cuts, the cap would get torn apart by the saw blade. I first tried duct tape on the front edge of the cap, and finally covering the whole cap with duct tape. This helped in only keeping the cap from total self-destruction. I was still breaking one or more connections of the plastic to the edge of the cap, but the tape was now holding them from getting totally torn off. Of the nine caps I ended up cutting, three were total losses, and only one was cut that was perfect. The rest had one of more breaks that were fixed with a drop of frag glue. Here are two caps, one where I was first experimenting taping just the front edge and the other were I taped the entire top of the cap.
The caps were then taped and painted with flat black paint. If this doesn't resolve the excess moisture problem, the next step is to remove the top altogether.