Has anyone investigated the "Polar Bear" conversion (4 white print heads) to the Brother 541? I'm looking to buy a used 541 and then buy the "Polar Bear" white heads (same white heads that are used on the 781). Told I would need to buy Lawson or other pre treatment machine plus an Insta 220 volt press (with air compressor) to be able to do the job correctly (looking to buy these two items used as well). Pre treatment solution has so much water in it that with a standard heat press set at 350 degrees, the water brings the temp down to 300-315 and takes at least a minute to get back up to temp for the pretreat to set properly. This is for each shirt! In addition, 1000 lbs of pressure is needed to press the shirt fibres flat (hense the Insta 220 volt press). All this was pitched to me by my Brother dealer. I will be his first white ink 541 converstion. Untimately, after white has been printed, the platten can be removed and placed on a traditional 4 color brother 541 (which I already own) and color printed on top of the white. Registration is a problem right now and so the mass rollout of "Polar Bear" is still on hold. I'm willing to get started just being able to print white on dark shirts which is a very big part of my business. I still use vinyl and it's really becoming a pain. If anyone has more knowledge than I do, please advise.