Best Onyx+ Sleeve Insertion Method?

Wondering if anyone has a good method for inserting the sleeve into an Onyx+ to avoid a big air bubble from forming while inside the device.

I do my best to put the sleeve in with no air bubble. I squeeze the air out of the sleeve before inserting it into the device but there is only so much you can do to keep the opening closed while putting the pen15 into it.

Air pocket also develops immediately if you have to pull out to readjust or anything.

Looking to switch to the handy soon because it seems but better so if you have a strong opinion on that / handy compatible sleeve suggestions pls share

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