>>6426390 hereTested fit of the piece. Very good fit, but the handle is made for child hands - it would need to be taller for mines. The "blaster modification needed" the piece mentions seems to be that, for a bolt to go through the holes, it needs removal of the two screws that hold the handle mount together, plus drilling through the plastic shroud of the screws - only advantage over just gluing the handle seems to be posibility of removal. Dunno if I'll bother with that.
Also, there's no currently room for a flashlight because the oversized jewel button gets in the way - I guess it's Dremmel time.
Next step,
https://www.youtube.com/watch?v=O4irXQhgMqg