So you want to spend another £2500+vat for a "just in case" machine.
If you have a decent supplier, if you have a vac motor down today you should have delivery of a replacement tomorrow.
Is it not prudent to have 2 machines on board? Is it not wise to have 2 machines for those 2 man big commercial jobs? Is it not wise to have a back up in case all fails?
What happens if that custy can't wait another day or two for me to get myself sorted out, I loose the job
