2 different sizes from Berea
Joe Pack, New London, OH
>I agree with the quality of Berea's mandrels. Be aware, though, that they have 2 different sizes - A (7mm, like most others) and B. If you buy your kits from other sources, their bushings will likely all fit the 7mm mandrel regardless of the kit you are using. If, however, you use Berea's kits, some use the larger B bushings which require the B mandrel.
As it was explained to me by the folks at Berea, some of their larger pens require larger tubes. With the larger tubes, the use of a thicker, supposedly stronger, mandrel is possible. The result is less flex under pressure.
If you go with Berea's mandrels, or even another source, I strongly suggest getting the morse taper adapters instead of using a chuck. And, if you do go with Berea, remember that their A and B mandrels use different morse taper adapters...one size does NOT fit all.