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Hairball, I used brass tubes to replace the stock aluminum units. The brass tubes are slightly larger diameter. There is a size that is exactly perfect for 4x8 flanged bearings. The ID needs to be...

2 in each drive tube (4 total)
2 in each outdrive (4 total)

However, I ended up removing the modified outdrives and installing the stock ones (with bushings) as the outdrive that were driled out...

I tried putting the steering servo on a sliding mechanism.

I have always done series - series or parallel - parallel, except for once.

arrrgh!
The whole parallel thing is getting on my nerves.
There is no problem with it. I am living proof.
In fact, the only time I damaged my packs was whgen I had them in series. Of course I had...

Anyway, the parallel thing should not scare anyone. I have been doing it for years and years. Even with pretty hot 15 turn Reedy Sonic motors, there was no problem. Of course if you ran a 1200 Radio...

I have a 38' Fountain.
Pretty quick.