Pump timing adjustment without tools

[fathead431]

I know that timing the injection pump "by ear" is possible, can anyone provide guidance as to how to loosen the pump from its mounting point for adjustment?
I'm running my engine on waste veg oil, and its getting pretty awful injector knock. the problem goes away on diesel, so the timing is slightly out.

and any guidance as to how I should be doing it?
I.E engine warm or cold?
adjust timing, start, test, repeat until smooth?

thanks

before anyone says "just get the tools" they are simply not available in the UK.