changing from Allen Bolts
 

has anyone changed there bolts from allen to cross head for example. i keep rounding allen keys and bolts and it just annoying

You will round cross heads far easier, don't overtighten screws or use too much threadlock, also get a decent set of Allen drivers. You could also use better screws or even stainless screws but stick with the hex head.

Use a dab of the thust bearing grease on the screw when you screw it into the plastic. A little lubrication makes it easier, less force needed, less chance to strip something.

A quality hex driver is a must on these buggys, but if your'e going to swap the screws out, go for some 12.9 grade hex ones.

Where to buy those screws from? Could you link a direct page which has those screws needed for the Mad Rat?

sorry, we had to go through the manual and put every screw one by one in the shopping cart on the site, took forever :(