Quote:
Originally Posted by Kahuna
If I might ask?
I have heard the term "Bullet Proofing" a Columbia and have always wondered what that meant, OR if it was a useful upgrade?
I remember several years ago that Paul, "Rumbleseat", had one done by some "expert' and it failed leaving him a few hundred miles from home and not too happy.
Not meaning to hijack the thread.
Jim
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Jim, I have my Columbia apart, and I took these pics show the drum which carries the diff spider.
For ease of manufacture/assembly, the spider drops into open ended slots in the drum. So it is not as strong as it would be if the slots were closed at the top. Evidently, these can open up if abused. The bullet proofing requires some of the spider ends to be ground off, then the drum outer diameter to be turned off, and a steel ring pushed on. This has been done in the third pic.
Mine is in as new condition, looks really well made, and I dont think I need to do the proofing.
Cheers, Tom.