Typically you do not want to scratch or back-cue with an Elliptical needle like the G3/GII
Not saying it's impossible, but it very tricky to balance the tonearm properly to allow back-cueing with out skipping or damage to the record. I'd switch to any spherical that fits
Any of the following would work T3, DS3, TII, EP-DJ, DM2 (MK II / MK III)
Ideally you want a T3 or T2 (TII), but they are in limited stock.
Depending on where you are located you can find some online retailers selling them via google / e-bay.
Or
You can have a store order the following which is still available form our warehouse:
Part# 07014-09800-00 DM-II STYLUS
Part# 07014-09900-00 DM-II DP (which stands for Disco Pack and includes 3-styli)
Hope this helps,
GPA~DJ