Spider-cinerator v2

A sudden drop in the local spider population was making it difficult to use my expanded Spider-cinerator.  I did finally find a Spider past dawn, and lured it up onto my glass roof nervously.  I feared for nothing, for even after shooting it repeatedly the spider seemed to be afflicted with perpetual amnesia after I got more than a few blocks away.

Finally I just started pushing it towards the pool.

Maybe it was a pacifist spider, and I have committed a terrible act against spider-kind by burning their benevolent emissary to death.

Please, not the lava!  Can't we be friends?

Sorry spider, it's all in the name of personal safety.  

Unsatisfied with the safety of my incinerator, I set to redesiging it based on a mob grinder design by Ethos called The Sizzler.  While I have no mob farm to hook it up to, the concept of protective water above my head instead of scary lava was very appealing, and I might get the odd string drop or two - unlikely, but the original has a 100% drop destruction rate.

I was pleased with this until I realized it was one block too high. 

The completed Spider-cinterator mark two has lava suspended by signs, and a pool of water below that drops down into my garden.

Let's hope this works.

Long hours were spent in the dark of night, wandering around under my fragile glass roof.  Finally as the light of dawn began to glimmer in the east, I heard the distinctive shriek of a hungry spider locking onto my position.  

I danced the spider over to the new disposal area, strafing back and forth trying to maneuver it in.

Either this spider was much smarter than its passive cousin, or I was just a really bad Spider herder.  It simply lept over the lava and onto the half-stone block caps instead of entering the maw of fiery death.  Can't say I blame it.

Finally though, I must have jigged the right moves because I was blessed with the sight of a toasty red spider burning on my roof. Conclusion - Mark two needs to lose the roof, see if that improves ease of spider toasting.