There's a whole bunch of info on Scamp axle
replacement in the Yahoo Scamp
archives. The big trick is to get the axle
yourself (after consulting Steve at Scamp
as to exactly the right one -- If you order thru an axle
place it might cost more than twice what you'd pay ordering direct from Dexter (voice of experience speaking here). Next best thing is to order it from Scamp.
Now is also a good time to consider brakes
if you don't have them because they are very inexpensive if ordered with the axle.
There is a LOT of info on Dexter's web site about measurements, etc., but it is sometimes hard to dig out. Download everything, print it out and read it. BTW, Dexter wants to see three or more inches between the top of the tire and the fenderwell; anything less is weak "rubbering".
There is also another company out there making torsion axles for small trailers called ALCO.
Pete in the RatHaus in Silverton Colorado