A small leak can be beneficial, a large leak is just a leak.
The rule of thumb is:
If you can slide a Popsicle stick in the ends easily, it's probably too large.
You have a little more "wiggle room" to spare with big blowers as you are only moving so much airflow through the actual
glide, on smaller units we like to see a snug fit.
But....the TEST is the drying, is the unit drying/extracting well? If it's improved over a non-glided wand, you are probably just fine as is.
If the gap is significant, your wand will leave the carpet as wet, or wetter than no glide at all.
Fortunately this is easy to verify on the first job you clean with it.
Today's GreenGlides are very refined, unless the wrong glide is fitted to your wand, it's not likely you have an issue.
We spent this last year really dialing in the fit on many wands, as the wand mfgs. make changes to their wands, we try to keep up.
Rob, it's possible you got an older model CMP, as it's one we did revise last year, let me know which one it is, Hole, Slot or Hybrid and we'll exchange it.
Tman, the Factory 2nd glide you bought off the site is most likely a byproduct of a model upgrade, quite serviceable I'm sure, just make sure it's extracting well (as above test), nothing a dab of sealer couldn't remedy.
I'll look for your email Rob, just send to
Info@GreenGlides.com (shipping is always free).