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If you get a Moonlite focuser, Sirius in Brisbane and myastroshop carry them cheaper than one other one mentioned in this thread (considerably cheaper). The SW Crayford is pretty dodgy, unfortunately, so either an upgrade to Moonlite or if you can stretch it, Feathertouch, is a good option. If the budget WON'T then I can detail to you how to significantly improve the functionality and weight bearing capacity of the stock SW focuser - and it is a VERY cheap fix - under $10!!!
As is, the SW focuser won't hold much weight - definitely not a DSLR at any angle approaching zenith, even locked down with vice-grips and King Kong's muscles. You CAN adjust the draws somewhat, but the issue is the drawtube flat and the pinion - not enough tension on either. It is as simple as installing a section of shrink tube over the pinion that fixes this, then re-adjusting, but it also means disassembly of the focuser - not sure how mechanically minded you are, but it is simple. It DOES increase the feel of the focusing somehwat (feels tighter and heavier, which it is), but it will hold more than just a light EP now (I found that they would often slip even with the lightest of EP!).
Enjoy your scope - they are pretty darned nice, especially for their price point. I had an ED100 for some time, andapart from the focuserissue, it was a nice bit of kit.
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