I picked a TaylorMade Ghost Manta Belly Putter recently, brand new still in wrapping for the equivilent of GBP 30.00 Thought I would have a go at modifying it to near normal playing length. I have been playing a TM Spider Blade at 35" which has counterweight grip so thought I would try to go near the same with measurements. The Belly Ghost Manta has a heavier than normal head so after cutting the shaft to 35" I counterweighted a TwoThumb Snug Daddy 33 grip which weighed 66 grams by inserting a steel bolt weighing 83 grams up into to the butt end of the grip so the bot slid into the open top end of the putter shaft as the grip was fitted. No idea what the SW is but the feel is good and the results are very satisfactory. A few rounds after starting out with it and now used to the feel my putting has improved significantly. Seen quite a few Premium Brand Belly Putters going at knock down prices so recommend anyone interested to have a go as I did.