Reverse sanding with Vicmarc Chuck 120

I purchased a Vicmarc 120 chuck several months ago. It is a direct thread 1-1/4 x 8.
It is a very nice chuck, strong, heavy duty, nickel plated etc.... I really like it. The only other brand of chucks I have experience with are the Nova chucks and they have set screws to lock the chuck for sanding in reverse.
The Vicmarc 120 chuck does not have the set screw for turning/sanding in reverse. I'm told they have a collar which fits over the grooves of the insert and the Vicmarc spindle. I do not have a Vicmarc lathe so the collar will not help me.

One of the venders on the phone said he reverse sands with a Vicmarc 120 routinely without an issue. He also said just make sure to run in forward first to set the chuck prior to going into reverse and do NOT use the plastic spindle washer. Sanding should be a slow speed operation.
Is this acceptable practice?

What do you all do for reverse sanding with a non-locking chuck like a Vicmarc 120?

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Reverse sanding with Vicmarc Chuck 120