Mike in regards to the alt-az adjusting bolts it is common to replace them with hi-tensile (stainless if possible) steel hex headed bolts. They wont bend and you can use a wrench to turn them.
The threads are both the same M10x1.5 about 100mm long for alt and 40-50mm for az. I got mine with nuts to use for locking, but probably not necessary.
Try Bunnings I think that's where I got mine from.
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