XRAY - Model racing cars

Am i the only one to have suffered with the t4s very poor quality diff casing joining screws quality ? I have built my diff for the t4 & purchasing another for the front. After running & finding i need to change the diff oil i have tried with both diffs to very carefully undo these screws only to find that the center hex round off before the screw will turn.
Does anyone know of any titainiam or better quality replacement screws for the diffs. They are a major floor in the xray t4 design as once the diff is built you have to purchase new screws & diff casing halves due to the damage caused toseperate the diff halves & replace the diff fluid.

One very unhappy Xray owner.

I changed mine for Torx screws, M2.5x6 I think;

No problem with mine. Oil changed several times

I've built about 8 Xray diffs and rebuilt them many times with no issue.

I suspect your allen driver needs replacing.

I have had no problem with the screws whatsoever. I'm using Hudy tools.

But I always replace screws as soon as they show the faintest sign of wear. My tool likewise.

Only thing you need to be aware of when assembling the diff is not to over tighten the screws.

Even if I'm careful of this I have damaged the thread in the diff housing a couple of times trying to get the screws as tightly as possible.

My remedy has been to find matching screws but just a couple of mm or so longer which gives the screws more thread to work with and also cures already damaged diff housing threads.

Sorry off the subject. I'm not familiar which torx bit I need for a 2.5 flat head screw. I see that Hudy has a T6 bit. Also need to know which bit for 3mm screws.

Thanks, Skiddins