Sorry I've misunderstood what the zerks are for.

So for them to work the bush needs a channel so the grease can get to the collar?

 

Correct, the powerflex bushing I got there was a small gap between the both bushing halves so was no need to drill through.

 

I didn't have the slightest problem using hole saws , if they melted their way through the bushes I suggest the hole saw was blunt , they do get hot and touch of coolant is a good idea.
Sawed through the out shell in the housing with a hack saw couple of mins , careful not to go into the housing , punched them out with chisel

Copper slip and any lithium based grease is not the best. For poly bushes , water proof silicone is the way to go , food grade stuff stays put very water resistant as you don'twant it getting in your pies , ask fatty ! Copper slip is not for this type of application it's not a lubricant , it's not water resistant.
I was thinking about grease nipples as this is quite a common thing that is done in the states to classic cars when they have poly bushes fitted , I asked the question here if any one had tried but it was like asking the captain of the Marie Selest , no reply. I was concerned about weakening the housing , I can see that the ones shOwn in the pic as in a good place for future access but is that also not a high stress area , in heavy impacts etc where do these arms fail ?


I used some purpose made stainless washers between the poly bush ends and the steel housings on the subframe and body as the in face needs to move freely as the bush needs to on the crush tube as we'll
I haven't any noise or binding since it was done , will be checking on the general condition etc latter in the year when I get to spend a day servicing the car.

 

Heat kills blades, drill bits - any cutting edge tbh. A bit of WD40 helps.

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I cut all of mine out with 2 size's one of which was 29mm , and both the cutters are still in good condition. Use decent Starret ones which are bi-metal and last, even when subject to improper use and abuse. Good lube/coolant any thing to cool and provide a bit of lube is fine. Of course you can dispense with the pilot drill so thats one thing that will not break or wear out.

As for getting the caster bushes out using this technique yes its all down to a lots of drilling and the odd snapped drill, but then again its use and abuse of tools using them not in the way intended or designed. Resharpen drill sin any case even if snapped , make nice short stubb drills.

 

polybushed my last rear camber bush today 2.5 hrs,though done in situ.

Snapped my first Dewalt bi metal blade,
hole saw method worked a treat until i broke it !!though was my fault

Geometry next..