Roll Bender Machine PR-5

I bought that roller to work with 3/16x3/4 stainless steel flat bar and it's just impossible to do so.
One of my colleagues says he machined the front wheel to be able to work with 3/16 material.

Follow-up review a month later. Have now made 10-15 additional circles in all four rod sizes, (dies arrived within 5 working days of order) and a couple from thinner flat stock. Still no issues, and I am posting this primarily as a follow-up on the shaft key size for the three roller wheels.

It is 5mm x 5mm x 16mm. (0.1969" x 0.1969 x 0.630).
1/8" is far too sloppy. 3/16" (0.1875) might work, but probably safer/easier to just order the correct size off the web and keep them in reserve since most stores don't carry metric keys.

Delivery: 5/5 (Ordered on Mon; arrived Ottawa on Fri. Wow!!). Seems pretty good. No instructions but assembly was obvious. One adjuster screw does not grab the wheel axle at full extension/home position so I need to lift it a few mm to catch, but no big deal (will look inside it later to see if I can fix it). The dies are very simple to replace (with your own Allen key), but may want to have a few shaft keys on hand in case you lose the originals. I tested it making some partial circles of 14ga flat to fix a garden planter, and it worked absolutely fine. Did not even need to bolt it to the bench. I also purchased 1/4" and 1/2" dies, and ran 3-4 rods of each diameter through them for fun. Turning 1/2" hot rolled into a complete ring smaller than about 9" diameter is a great workout complete with cursing, but it can be done if you are patient and you clamp/bolt it well. Turning 1/4" into a ring was obviously much easier and I took it down to about 5" with no issues, other than a bit of spiraling/alignment issues which was likely my experience vice a fault of the machine. As a hobbyist, not sure how it compares other brands but I was happy enough that I just ordered the other two round dies to have the full set of four (just in case this becomes discontinued in the future). I think it was a good purchase (especially compared to the smaller PR-3 or the cheaper version of a PR-3 at a certain Cdn tinkerers' store).