Yes, there is a small gap between the wall of the dome and the ring gear assembly mount. Its about20 to 30mm from memory.
You can get small bugs and that, but if you do the concrete slab properly, by ading a base step to the slab height, then you can make a wide lip or boundry and stop them from comming in. I didint do it this way, as it costs more to do the slab this way. So i just use surface spray along the rim edge (Inside), and this tends to kill 98% of bugs trying to come in. But, place a grease slick along the bottome ring, and you provide a wall that bugs dont like to walk on.
Surface spray works fine though.
Theo
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