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Yeah I tend to scour Craigslist and local estate auctions for equipment and stuff I could modify. MPLS has some decent used equip from time to time, as does Duluth, but you have to be patient, and ready to jump when something comes up. There are some other good DYI suggestions people have made here. I have made a Flat lap for thundereggs and agate geodes with a 110V motor, an arbor adapter to convert my motor shaft to a threaded end that accepts angle grander attachments (5/8-11) and bought a 7" Velcro head and silicon carbide sand pads. Works awesome. I got the motor for $20 on craigslist, and everything else cost less than $60. Its basically a 'Richardson's Ranch Thunderegg polisher' clone. Richardsons Ranch uses a 3450 rpm motor, which I have, but I may switch it out to a 1725 rpm as it gets the stones hot quick.

https://smile.amazon.com/gp/product/B00MZKTWG6/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

https://smile.amazon.com/Black-Heavy-Duty-Sanding-Discs/dp/B07CBCCBN9?ref_=ast_bbp_dp

https://smile.amazon.com/gp/product/B003ELTZ1W/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

I don't have that tool and I do not believe these types of chucks are standardized. If you could accurately measure the dimensions of the ones you have, that might be helpful.

To measure them you need a "precision" vernier caliper like this one-- https://www.amazon.com/Stainless-Micrometer-Measuring-Precision-Measurements/dp/B074HZ8S21/ref=asc_df_B074HZ8S21/? --You can get any metal one that looks EXACTLY like this that you find, they all work the same. It should be capable of fractional measurements in Imperial and Metric. ...And then learn to use it, if you don't already know. (note--the dial calipers only measure in one system, and the electronic ones don't work well)

Or a micrometer will work for measuring too, if you happen to have one. If you must buy something then the caliper above is generally more useful.

I have a couple Dremel-brand tools and also have some of the Chinese generic brass collets on tools I've made, and I can say that the China brass collets will not fit into the Dremel tool at all, and the Dremel collets don't stay straight in the China brass collet. The back sections of the China collets is thicker than the Dremel collets.

Alternately, you may be able to change to a China brass chuck. If the Micro Mark motor shaft is 2.35mm in diameter (which it very well may be, that is a common axle size for small motors) and you can get the old chuck off (without damaging the rest of the tool) then you can buy a China brass collet set that has the chuck and 10 different collets, from .5mm to 3.2mm, for ~$1.50 + shipping.

It will likely all need stabilization; not much is pulled up anymore that's gem-quality hardness. The hardness relates to the dryness of the mineral; the stuff closest to the surface with the most exposure to air will, over millennia dry and become hard. But that's the easy stuff to mine, so there's not much left.

You can stabilize yourself; it's not difficult but does require a small vacuum system like this, along with a stabilizing agent like Opticon. Depending on the rough, you'd likely stabilize twice - the first time for cutting slabs, and then each cut slab as well. I use a 5-gallon vacuum chamber and can easily get a dozen slabs in it.

https://www.amazon.ca/dp/3000474749/ref=cm_sw_r_cp_dp_T1_kqhozbCPS3E9J

That book was how I started finding out about faceting: Amateur Gemstone Faceting Volume 1: The Essentials Paperback – Nov 23 2014
by Tom Herbst (Author)

Then I bought this machine eventually: http://facetron.com/

And I bought some laps and other supplies from here: https://www.kingsleynorth.com/

I live near an amethyst mine so i get some amethyst to practice on when i get time.

Good luck

Get this book - Amateur Gemstone Faceting Volume 1: The Essentials. It lists many brands of machines and the pros and cons of each. Also it has what to look for in a machine.

It goes on to give a very thorough how-to for faceting, auxiliary equipment needed, etc. It's an excellent place to start.

Why not one of these doodads?

CO-Z Digital Level and Angle Finder, Angle Gauge and Protractor, Inclinometer, Box, Magnetic Base and Backlight, Easy Two-Button Operation for Bevel, Table Saw, Miter Saw Measurements and Leveling https://www.amazon.com/dp/B0797R51WX/ref=cm_sw_r_cp_apa_i_Bqv0Db5EGMF73

Legit just googled it then clicked on the first amazon link.
https://www.amazon.com/1800rpm-Faceting-Machine-Jewelry-Polisher/dp/B07XNPZT5W

https://www.amazon.com/gp/aw/d/B000BUUT9G/ref=mp_s_a_1_15?ie=UTF8&qid=1519361193&sr=8-15&pi=AC_SX236_SY340_QL65&keywords=3lb+tumbler+barrel&dpPl=1&dpID=416tk27RhOL&ref=plSrch

https://rocktumbler.com/barrel.shtml

Im tubing it alone. I just started a second batch of it on step 2. I'm using these grits that I bought on amazon. https://www.amazon.com/gp/aw/d/B008BN48Y2/ref=pd_aw_fbt_21_img_2?ie=UTF8&psc=1&refRID=FR31BPDH214BAKZKSG7J