Cobblestone Generator with Buildcraft 2.X

I was looking into old stuff when I found a pretty worrying situation: the infinite cobblestone generator, the way they were before, no longer worked.

The old version:

The problem that appeared is simple: in the last 15 or so seconds of the video you see how the pipes left by the mining wells dissapear when pushed. This no longer happens, so they block the way for more cobblestone to be made. At first, I tried to add a filler in the front to delete the pipes, but that proved too slow and wasteful. So I went and made a single-lane cobblestone generator replacing the mining wells with the filler (with the 3x3 glass disposition) dropping the blocks into obsidian pipes. However, soon the new engines would run a little too quick, so the filler would think it's done with the job and go idle (yeah, with the engines, it's like working with continuous current, so it doesn't check if there is something or not after a full cycle with an empty area). So I ended making a two-lanes cobblestone generator again, but using the second one as a backup.

Here is the new video:

At first I show you the patched old version, then the new version, and the last three minutes or so show how to make the new version.
Short explanation for those who already know how to make the old one: make it like always, without the mining wells, and put the obisian blocks one block more away, then put a filler with the "clear area" program (a 3x3 glass grid) with the area selected over the two exiting lanes for cobblestone. Behind the three blocks the filler will clear put obsidian pipes, connect them to steel pipes and those to the main pipe lane (in the video I connected the central steel pipe to some stone pipes, and those to a chest), then fill the borders so the cleared blocks will fall over the obsidian pistons.

Old Vs New: comparison.
The old version, with the patch and the new needed filler adding, would use tfour stone engines, 2 mining wells and two fillers (or it will have one of the mining wells idle most of the time).
The new version eliminates the mining wells and, while it will produce less cobblestone, it will need only one engine and one filler.

New problems:
I have noticed that, from time to time, the stone engines overheats and start accelerating. This can only be solved by removing the engine and putting it again, so don't put more than 8-10 coal/charcoal inside. Also, if for some reason the filler shows red lights instead of green ones (after you set up the clearing program), just removing one of the glass blocks and putting it again into the programming slot will restart the machine.
Also, the wooden engines (the slowest ones that don't need fuel or coal, just redstone current) cannot power fillers, so...

I will attemp to make a tree farming for the next video, but I'm afraid each tree will require its own filler, so it might be "awesome but inpractical" (yeah, I know there is already a mod called "factory mod". However, I think it isn't actualized to 1.7.3... and I think it is not integrated with Minecraft Forge).

Until the next time, have fun!