if you just want to 'try a bit' of jewelling, and don't want to wait for the proper stuff, or even 'close....
grab a bit of soft plastic rod, the stuff that you can easily mark with a thumbnail, and toss it in the chuck with maybe 1/4" or 3/8" sticking out, especially if your press is a bit wobbly, or doesn't run down to a fairly slow speed..grease up your workpiece, and if there is no grinding compound or similar laying around, just evely dust the workpiece with fine sand...
and give it a try...there will be some discrepancy between the swirls, but at least will give you a 'low ball' starting point to see if you actually like the effect it gives...
as far as I remember, on small sizes [1/4" and under], i used probably around a 30% overlap, and on large decorative swirls [like with a 2" wire brush on aluminum] I used less of an overlap, probably around 15% or so..
The origional purpose of jewelling wasn't for decoration, just a surface roughening on rifle bolts and similar 'slow speed' movements to give oil or other lubricants a bit of a bite so they wouldn't wipe / wear off as quickly..
don't remember what I used for aluminum, but for steel and brass I used an ignition spray sealer that dried and left a very thin satin finish and lasted quite well, especially on firearms that were stored for longer periods of time...
It was called Atlas PIB waterproofing compound..
the two example actions are a 96/34 Swedish Mauser 6.5 and a 08 Mauser [Voere] in 7mm Rem Mag
the last is a pic of todays project, a 3x6 foot Charcoal BBQ for the local casino here..not real thrilling or challenging, but helps pay for shop toys...
enjoy...