larryfoster,
Follow the recommendations for cleaning it up that John and JPG gave you. I have also used a Dremel tool with a small wire brush to get into the mounting hole to help clean it up after removing any rust. Avoid using abrasives to clean up the mounting hole as much as possible. As John said,
Under best circumstances, the drill chuck can be a pretty tight fit on the spindle.
You want to maintain that tight fit to avoid getting any wobble to the Drill Chuck when mounted.
JPG mentioned that the Tapered Flat of the Quill's Spindle does not go all the way to the end as seen in the picture below. Having the full round of the Spindle on each exposed end keeps accessories mounted staying true. When mounting an Arbor, Chuck, etc. to the Spindle make sure it seats firmly against the Spindle Knob.
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- Quill End labeled.jpg (108.65 KiB) Viewed 24101 times
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I can't tell for sure which Drill Chuck you have from your picture.
In the picture below are almost all of the Drill Chucks supplied with the Shopsmith Model 10's and Mark Tools over the years. The missing one is a Jacobs Multi-Craft Chuck like the one on the left of the top row. It would be 27100 version 2 with different markings on the Chuck.
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- Drill Chucks - labeled.jpg (145.67 KiB) Viewed 24101 times
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Below is a picture of the Jacobs Multi-Craft Chuck missing from the picture above.
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- JACOBS MULTI-CRAFT MC3326 d.jpg (166.68 KiB) Viewed 24101 times
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You can see many of the Drill Chucks look very similar. the three middle ones on the bottom row differ only in the set screw they have. The two Jacobs Multi-Craft Chucks on the top left plus the one shown in the separate picture differ in the labeling on the Chuck. The same is true about labeling for the three on the top row mid to right. Three of the Chucks have 2 different part numbers for the same Chuck. 2 are because all part number changed first in November 1951 and again early 1964. 206100 going to 27100 was a part number change for just that Drill Chuck. You can find different part numbers for the Drill Chucks besides the ones listed but most likely are for individual parts that make up the Drill Chuck Assembly not the entire Assembly which are the part numbers listed.
There was a fourth version of the Jacobs Multi-Craft Chuck shown in the picture below that I cannot confirm if it was ever supplied with a Shopsmith Mark tool. It differs in shape from the other three.
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- Multi-Craft Chuck V-4 b.jpg (39.11 KiB) Viewed 24101 times
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The above information does not include the 515953 1/2" or 556273 5/8" Keyless Chucks Shopsmith has sold.
