I am looking at Figure 3.13 and the table directly below.

I am thinking about wrap around bend testing for M22 aluminum  1/8" or less. [down to 18 ga <0.040>]  This figure suggests that a whole bunch of mandrels are going to be necessary to qualify different sheet thicknesses.

Since the metal is so thin, would I be totally out of compliance if I constructed a wrap around fixture than secured one end of the coupon and I simply grasped the other end with a clamping device and wrapped the thing around the mandrel (dimension "A")  ????

Rather than buy or have our machine shop produce a bunch of additional parts for our wrap around tester I was thinking it would be pretty easy to bend these thin coupons by  hand in a solidly built hand wrap fixture with multiple mandrels I could simply screw into place....  Is the "Roller" in fig 3.12 a requirement?

It seems like the "General Notes" at the bottom of Figure 3.13 suggest this is possible... I just want to make sure I'm making a sound interpretation.