Hi Joe
Good to hear you find the 17mm T4 good.
I've noticed the bottom lense is close to the eyepiece skirt.
If you add a 2" filter ( with glass removed ) onto the threaded base of the eyepiece this will give you an extra 5mm from the EP lense to the base for added protection.
BTW if your not happy with doing this, and you're not using the EP very much you could always sell it to me
David