Greetings Mopheadrob,
Quite a common problem with 25.4 mm tube scopes and high magnification. To save spending any more dosh you could try shimming the front end of the rail between the rail and the receiver ring. I don't think a beer can is going to cut it however. A bit of 0.75 mm aluminium flashing is probably going to be needed. You can calculate the thickness needed easily enough. You should be able to get an off cut of 0.75 aluminium from a roofer or plumber. I used some recently to shim the front ring on a Pecar scope. All the best.
Grandpamac.
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