At the risk of getting into a ******* Match around here.. this is my opinion
All the kits I purchase are either CSU or Berea (from Arizona Silhouette). I will not purchase the 24K, Upgrade Gold or 10K Gold.. only TN Gold or better platings... especially if you plan to give away or sell your pens.. you don't want the platings to start fading.
Unless you are going to produce certain Berea kits (RT Euro, Perfect Fit Convertible, etc.) you only need the standard mandrel...
You don't need an adjustable mandrel... I used standard mandrels for a long time.. I just recently purchased an Axminster chuck and will be using that.. but the standard mandrels are good.. just don't buy junk.
Now give me a second to put on my hardhat.. cause I know someone is going to throw something over this..
I recommend starting with Cigar kits instead of slimlines. IMHO, it is a lot easier to cut a gentle curve than it is to cut a perfectly straight barrel. I also find that Cigars show off the wood better for only a slightly higher price for the kits.
I will now crawl back into my foxhole and prepare for the artillery assault.[}
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